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Solutions Search - Simulation & Design Tools

Linduino Change Log 10/24/2017

Malavika Sajikumar - Firmware Engineer Oct 24th 2017
We regularly update our Linduino Sketchbook with new products, new files and updates. Please download the library, or rerun your automated installers for an automatic update. Linduino Change Log 1.2.4.    Oct 24, 2017 Demo Program Changes:DC1490.ino: Bug Fix - Displayed hex values have leading FFFF for inputs ...

Blog Post Linduino 

 

LTspice: Simulating SAR ADC Analog Inputs

Kris Lokere - Strategic Applications Manager
Gabino Alonso - Strategic Marketing Engineer
Sep 19th 2017
As resolution and sample rates continue to rise for ADCs, the driver circuitry for the analog inputs, not the ADC itself, has increasingly become the limiting factor in determining overall circuit accuracy. Beyond a simple 1-pole RC lowpass filter (LPF1) for noisy input signals (Figure 1), a coupling ...

Blog Post LTspice 

 

Interfacing Linduino to LTC2508-32

Malavika Sajikumar - Firmware Engineer Jul 11th 2017
Introduction LTC2508-32 is a fast, 32-bit SAR ADC with an integrated configurable digital averaging filter. The demo board, DC2222A-B, has connectors to talk to DC890, as well as Linduino. The demo manual describes how to connect the board to a DC890 and to run PScope. It also explains how to use a Linduino (or a DC590B board) ...

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High Efficiency Solar MPPT Battery Charger Using LT8611 and AD5245

Perry Faubert - FAE Jul 10th 2017
Introduction Outdoor applications that use solar panels in the range of a few watts often use a microcontroller-based MPPT (Maximum Power Point Tracking)  function to extract the maximum power available over the full range of environmental operating conditions. Many microcontroller-based MPPT solutions designed for ...

Blog Post LTspice 

 

LTspice: Using .MEAS and .STEP Commands to Calculate Efficiency

Gabino Alonso - Strategic Marketing Engineer Jul 9th 2017
Predicting the efficiency of an application is vital to evaluating design trade-offs of a switching mode power supply. Two useful tools, the .step and .meas commands, can be used to calculate and plot efficiency over a range of load currents. To evaluate efficiency, clearly label your input and output voltage net as IN and ...

Blog Post LTspice 

 

LTspice: Worst-Case Circuit Analysis with Minimal Simulations Runs

Joseph Spencer - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jun 8th 2017
When designing a circuit in LTspice, you may wish to assess the impact of component tolerances. For example, the gain error introduced by non-ideal resistors in an op amp circuit. This article illustrates a method that reduces the number of simulations needed, and as a result speeds your time to results. Varying a Parameter LTSpice ...

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LTspice: Modeling Constant Power Loads

Gabino Alonso - Strategic Marketing Engineer Jun 4th 2017
There are several types of constant loads used in simulating a power supply system: constant resistance, constant current and constant power loads. For instance, a constant current load dynamically adjusts its resistance as the load voltage varies, such that the load current remains constant, I = V/R. Constant resistance and ...

Blog Post LTspice 

 

LTspice: Simple Idealized Diode

Gabino Alonso - Strategic Marketing Engineer May 2nd 2017
LTspice semiconductor diode models are essential for simulations, especially when you want to see results that include breakdown behavior and recombination current. However, as complete as the semiconductor diode model is in LTspice, there are times when you need a simple “idealized diode” model to quickly simulate, ...

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LTspice Models of ISO 7637-2 & ISO 16750-2 Transients

Dan Eddleman - Senior Applications Engineer Apr 5th 2017
Introduction Simulating the ISO 7637-2 and ISO 16750-2 transients early in the design phase of an automotive product can pinpoint issues that would otherwise come to light during electromagnetic compatibility (EMC) testing. If a product fails EMC testing, hardware modifications are required, project schedules suffer, and extra ...

Blog Post LTspice 

 

LTspice: Creating and Working with Symbols

Markus Holtkamp - Field Applications Engineer Jan 12th 2017
In LTspice you can create a symbol automatically in two situations; either you have a subcircuit definition in ASCII fomat at hand or you want to create a hierarchy with your own schematics which are building blocks for larger designs. Hierarchical schematic drafting in particular offers powerful advantages by enabling larger ...

Blog Post Video LTspice 

 

Setting up Linduino, Visual Micro, & Atmel-ICE for Hardware Debugging

Dan Eddleman - Senior Applications Engineer
Malavika Sajikumar - Firmware Engineer
Jan 10th 2017
Introduction The Linduino is Linear Technology’s Arduino compatible system for distributing firmware libraries and example code to customers of Linear Technology’s integrated circuits. The design is based on the Arduino Uno, using the Atmel ATmega328 processor, while adding a 14-pin QuikEval™ connector that ...

Blog Post Linduino 

 

Increase Spectral Resolution for the LTC2387-18 Demo Board - Part 1

Doug Stuetzle - Senior Analog Applications Engineer Oct 14th 2016
Introduction The LTC2387-18 is a low noise, high speed, 18-bit 15Msps successive approximation register (SAR) ADC. The combination of excellent linearity and wide dynamic range makes the LTC2387-18 ideal for high speed imaging and instrumentation applications. No latency operation provides a unique solution ...

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Increase Spectral Resolution for the LTC2387-18 Demo Board - Part 2

Doug Stuetzle - Senior Analog Applications Engineer Oct 14th 2016
Introduction In Part 1 we designed and tested a lowpass + downsample structure that increased the spectral resolution of the DC2290A-A demonstration circuit for the LTC2387-18 high speed successive approximation register (SAR) ADC from 114Hz to 0.596Hz per bin. The average noise level per bin was ...

Blog Post PScope 

 

On-Board EEPROM on QuikEval supported Demo Boards

Malavika Sajikumar - Firmware Engineer Oct 4th 2016
Most of our QuikEval supported demo boards have an on-board EEPROM which is used to store a string of characters. The string holds information about the part number, demo board number and other characteristics of the board. For example, here is the string stored in the EEPROM on demo board DC956: “LTC2485,Cls,D2484,01,01,DC,DC956,---------------“ This ...

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LTspice SOAtherm Support for PCB and Heat Sink Thermal Models

Dan Eddleman - Senior Applications Engineer Sep 1st 2016
The SOAtherm model distributed with LTspice software and simplifies Hot Swap and Surge Stopper designs by verifying directly within a circuit simulation that a particular MOSFET’s Safe Operating Area (SOA) is not exceeded. This article assumes a basic understanding of the SOAtherm model. If you are not familiar with SOAtherm, ...

Blog Post LTspice 

 

Using the Averaging Functions of PScope

Clarence Mayott - Applications Engineer Jul 18th 2016
When looking at the sampled output data from an analog to digital converter (ADC) it is often desirable to average blocks of samples from cycle to cycle.  This will reveal more details about the ADC’s characteristics, like the true shape of the noise floor, and may reveal low level spurs as well. PScope, Linear Technology’s ...

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Using LTspice to Characterize Capacitor Banks

Steve Knudtsen - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jul 12th 2016
Capacitor banks are used to filter noise and provide energy storage for fast load transient response.  For modeling the stability of a DC/DC converter the ESR of the capacitor bank is needed.  This can be easily done if only one type of capacitor is used with multiple capacitors in parallel.  This is difficult ...

Blog Post LTpowerCAD LTspice 

 

LTspice: AC Analysis Using The Step Command

Gabino Alonso - Strategic Marketing Engineer Jul 4th 2016
In LTspice, AC analysis involves computing the AC complex node voltages as a function of frequency using an independent voltage or current source as the driving signal. The small signal analysis results are plotted in the waveform viewer as magnitude and phase over frequency. AC analysis in LTspice has a number of settings: ...

Blog Post LTspice 

 

LTspice: Using Time-Dependent Exponential Sources to Model Transients

Mitchell Lee - Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
May 15th 2016
When working with Surge Stoppers or Hot Swap Controllers, occasionally there is a need to simulate a circuit's behavior with a specified voltage or current transient. These transients are usually modeled using a double exponential waveform characterized by a peak voltage, a rise time (usually 10%–90%), a fall time to 50% ...

Blog Post LTspice 

 

Audio Spectrum Analyzer with the Linduino

Noe Quintero - Application Engineer Apr 12th 2016
There are several methods for implementing a spectrum analyzer. I’ve been working with SAR ADC products for some time, and using the Fast Fourier Transform (FFT) for spectral analysis on a daily basis. Another common method for implementing a spectrum analyzer is called the swept-tuned receiver. This method involves mixing ...

Blog Post Linduino LTspice 

 

LTspice: Behavioral Voltage Sources

Simon Bramble - Field Applications Engineer Apr 4th 2016
Nearly all circuits that you simulate need a voltage source of some kind. In LTspice, the humble voltage source rarely gets to demonstrate its true capabilities. This video will help you learn some of the undiscovered talents of the LTspice voltage source. In this video we’ll explore the power of the behavioural voltage ...

Blog Post Video LTspice 

 

LTSpice: Plotting a Parameter Against Something Other Than Time (e.g. Resistance)

Joseph Spencer - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Mar 25th 2016
A common use for LTSpice® is to run a time domain transient analysis where a parameter (e.g. voltage or current) can be plotted against time. Occasionally, you may wish to know the behavior of a circuit versus another parameter such as resistance. This can be done by using the “.measure” and “.step” ...

Blog Post LTspice 

 

LTspice: Generating Triangular & Sawtooth Waveforms

Gabino Alonso - Strategic Marketing Engineer Mar 16th 2016
Some of the most common waveforms needed in simulating voltage and current sources are sine, square, triangular and sawtooth shapes. LTspice® simulation software has a built-in pulse, sine, exponential, single frequency FM and an arbitrary piece-wise linear functions available in the source component editor. Although ...

Blog Post LTspice 

 

LTpowerCAD: Power Design Summary

Maurizio Pogliani - Field Applications Engineer Mar 11th 2016
The LTpowerCAD is a design tool program that simplifies power supply design. Unlike conventional simulation tools, the LTpowerCAD guides a user through a power supply design via a set of steps to ensure you meet your requirements. This video covers the Power Design Summary which provides a complete details that highlight your ...

Blog Post Video LTpowerCAD 

 

LTpowerCAD: Loop Compensation & Load Transient

Chris Gass - Field Applications Engineer Mar 11th 2016
The LTpowerCAD is a design tool program that simplifies power supply design. Unlike conventional simulation tools, the LTpowerCAD guides a user through a power supply design via a set of steps to ensure you meet your requirements. This video covers the Loop Compensation & Load Transient step which helps you optimize your ...

Blog Post Video LTpowerCAD 

 

LTpowerCAD: Loss Estimate & Break Down

Mats Hellberg - Field Applications Engineer Mar 11th 2016
The LTpowerCAD is a design tool program that simplifies power supply design. Unlike conventional simulation tools, the LTpowerCAD guides a user through a power supply design via a set of steps to ensure you meet your requirements. This video covers the Loss Estimate & Break Down step which provides efficiency and losses ...

Blog Post Video LTpowerCAD 

 

LTpowerCAD: Power Stage Design

Robert Rynkiewicz - Field Application Engineer Mar 11th 2016
The LTpowerCAD is a design tool program that simplifies power supply design. Unlike conventional simulation tools, the LTpowerCAD guides a user through a power supply design via a set of steps to ensure you meet your requirements. This video covers the Power Stage Design step which offers a user friendly schematic interface ...

Blog Post Video LTpowerCAD 

 

LTpowerPlay Software-Based Power Supply Configuration and Debug Tool

Mar 8th 2016
Linear Technology’s Power System Management (PSM) devices add digital PMBus/SMBus/I2C interface based control, telemetry and black-box fault recording to analog DC/DC power converters, providing high level integration, accuracy and increased reliability to your power system. The associated LTpowerPlay® GUI provides ...

Video LTpowerPlay 

 

Introduction of LTpowerPlanner Program – A System Level Power Architecture Design Tool

Henry Zhang - Applications Engineering Manager Feb 19th 2016
Modern electronics systems have an increasing level of complexity. There can be a large number of power rails and supply solutions on a system board. Before choosing or designing each individual power supply, the system hardware engineer first needs to understand the system power needs and then architect the system power tree ...

Blog Post LTpowerCAD 

 

LTspice: Importing and Exporting WAV & PWL Text Files

Simon Bramble - Field Applications Engineer Jan 20th 2016
Sometimes you may want to apply a voltage source to your circuit whose characteristics have been derived from an external source whether it is a WAV file or a just a list of time and voltage instances. LTspice allows you to do this and this video will highlight how to import and export WAV audio files as well as how to read ...

Blog Post Video LTspice 

 

LTspice: Combining Multiple Model Instances Into One Symbol

Gabino Alonso - Strategic Marketing Engineer Dec 21st 2015
When you need multiple instances of a model, it is easy to copy and paste a symbol, but sometimes you can tighten up your schematics by using a single symbol to define multiple instances of same device. For instance, instead of placing four identical capacitor symbols in parallel, use one symbol times four, “x4”. ...

Blog Post LTspice 

 

Designing Power Supply Parameters in Five Simple Steps with the LTpowerCAD Design Tool

Henry Zhang - Applications Engineering Manager Dec 2nd 2015
Application Note 158: Introduction System boards today have an increasing number of power rails and supplies. Since solution size, efficiency, thermal and transient performance are all critical for advanced power solutions, it is more efficient and cost effective to design customized onboard power solutions for a specific application, ...

Blog Post LTpowerCAD LTspice 

 

LTspice User Privacy Statment

Mike Engelhardt - Mgr. of Simulation Development Nov 12th 2015
As the Author and maintainer of LTspice IV, please let me assure you that LTspice does not nor has ever collected data about the user or any aspect of the user's design work. From conception of the project to release and over all the years of supporting the program, myself and my management have been committed to not collecting ...

Blog Post LTspice 

 

Achieving Low On-Resistance with Guaranteed SOA in High Current Hot Swap Applications

Dan Eddleman - Senior Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jul 29th 2015
Introduction The requirement for live insertion and removal in high current backplane applications demands MOSFETs that exhibit both low on-resistance during steady state operation and high Safe Operating Area (SOA) for transient conditions. Often, modern MOSFETs optimized for low on-resistance are unsuitable for high SOA Hot ...

Blog Post Circuit LTspice 

 

LTspice: Speed Up Your Simulations

Gabino Alonso - Strategic Marketing Engineer Jul 20th 2015
LTspice is designed from the ground up to produce fast circuit simulations, but there is margin in some simulations to increase the speed. Note, there may be trade-offs in accuracy using the methods described here. For further details on any of these approaches, please refer to the LTspice Help File (F1). To measure the effects ...

Blog Post LTspice 

 

SPICE Differentiation

Mike Engelhardt - Mgr. of Simulation Development Jun 19th 2015
Analog design engineers lean heavily on simulation to predict circuit performance. The value of a simulator hangs on how well it can predict physical reality, and how quickly it can produce results. Discrepancy between simulated and real performance can send a product into costly iterative debugging cycles. SPICE is used for ...

Blog Post LTspice 

 

Designing a Power Supply in Five Simple Steps with LTpowerCAD

Henry Zhang - Applications Engineering Manager
Gabino Alonso - Strategic Marketing Engineer
Jun 18th 2015
Designing and optimizing switching mode power supplies is becoming a more frequent and challenging task, especially for in-experienced supply designers. The conventional “paper-design” method is not only time consuming, but also difficult without optimum results. LTpowerCAD design tool provides an easy and simple ...

Blog Post LTpowerCAD 

 

LTspiceIV: Voltage Controlled Switches

Gabino Alonso - Strategic Marketing Engineer Apr 9th 2015
LTspice includes a large number of excellent FET models, but sometimes you need to simulate a simple switch that opens and closes at specific times or under certain conditions.To insert and configure a switch in LTspice… (example is available at \LTspiceIV\examples\Educational\Vswitch.asc) Insert the symbol for the ...

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LT Programming Hex File Format Documentation -- In Circuit Programming

Mar 26th 2015
Purpose of Document The purpose of this document is to clearly articulate the structure of the LT Programming Hex file in such a way that test engineers can build infrastructure to parse these files and execute programming logic to successfully program one or more LT Digital Power Product devices in cicruit, during test, or ...

Blog Post LTpowerPlay 

 

LTC4226 Parallel MOSFETs in Hot Swap Circuits

Dan Eddleman - Senior Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Mar 13th 2015
The Good, the Bad, and the Ugly Introduction While it is often desirable, and sometimes absolutely critical, to use multiple parallel MOSFETs in Hot Swap™ circuits, careful analysis of Safe Operating Area (SOA) is essential. Each additional parallel MOSFET added to a circuit improves the voltage drop, power loss, and ...

Blog Post Circuit LTspice 

 

Linduino PSM

Michael Jones - Applications Engineer Mar 12th 2015
While many engineers use a dongle and tools to configure Power System Management devices via PMBus, a growing number of designs are adding Board Management Controllers, or connecting their PMBus to an existing microcontroller or application processer. At LTC, the dongle/tool option is comprised of a DC1613 and LTpowerPlay, and ...

Blog Post Linduino 

 

Loop Gain and its Effect on Analog Control Systems

Simon Bramble - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Jan 26th 2015
Abstract This article brings together the ideas of open loop gain, closed loop gain, gain and phase margin, minimum gain stability and shows how these parameters are interrelated in a feedback system. It examines loop gain in terms of a theoretical control system as well as practical electronic circuits, including linear regulators. Introduction Bob ...

Blog Post LTspice 

 

LTspice: Connecting the Dots

Gabino Alonso - Strategic Marketing Engineer Jan 20th 2015
Sometimes the simplest things elude us. Typically, after placing components in an LTspice schematic you select draw wires (F3), left click to start a wire, left click again to change direction or join, repeat until your circuit is complete and then right click to cancel. But did you know you can draw wires through components ...

Blog Post LTspice 

 

LTspice: Copy and Paste Between Schematics

Gabino Alonso - Strategic Marketing Engineer Dec 11th 2014
Sometimes the simplest things elude us. One feature not commonly understood in LTspice is how to copy and paste between schematics using the duplicate command. To copy objects from one schematic to another, in the source schematic, invoke the duplicate command (F6 or Ctrl + C) — the crosshair pointer changes to the duplicate ...

Blog Post LTspice 

 

LTspice: SOAtherm Tutorial

Dan Eddleman - Senior Applications Engineer Oct 8th 2014
Verifying that a Hot Swap design does not exceed the capabilities of a MOSFET is a challenge at high power levels. Fortunately, thermal behavior and SOA may be modeled in circuit simulators such as LTspice IV® . The SOAtherm-NMOS symbol included in LTspice contains a collection of MOSFET thermal models developed by Linear ...

Blog Post Video LTspice 

 

LTspice: Using an Intrinsic Symbol for a Third-Party Model

Gabino Alonso - Strategic Marketing Engineer Sep 9th 2014
LTspice IV can automatically create a symbol for a third-party model, or you can associate a third-party subcircuit with an LTspice intrinsic symbol, as long as the third-party .SUBCKT model and the intrinsic symbol share an identical pin/port netlist order. For example, to add an N-channel MOSFET transistor symbol to a schematic ...

Blog Post LTspice 

 

LTspice: Modeling Safe Operating Area Behavior of N-channel MOSFETs

Dan Eddleman - Senior Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Aug 22nd 2014
Introduction Often the most challenging aspect of Hot Swap™ circuit design is verifying that a MOSFET’s Safe Operating Area (SOA) is not exceeded. The SOAtherm tool distributed with LTspice IV® simplifies this task, allowing a circuit designer to immediately evaluate the SOA requirements of an application and ...

Blog Post LTspice 

 

LTspice: Simple Steps for Simulating Transformers

Gabino Alonso - Strategic Marketing Engineer Jul 1st 2014
Here is the simple approach to simulate a transformer in LTspice IV: Draft an inductor for each transformer winding Couple them using a single mutual inductance (K) statement via a SPICE directive: K1 L1 L2 L3 1 The last entry in the K statement is the coupling coefficient, which can vary between 0 and 1, where 1 represents ...

Blog Post LTspice 

 

LTspice: Basic Steps in Generating a Bode Plot of SMPS

Gabino Alonso - Strategic Marketing Engineer Jun 3rd 2014
Determining the open loop gain from a closed loop switch mode power supply (SMPS) is best solved using Middlebrook’s method, which appears in the International Journal of Electronics, Volume 38, Number 4, 1975. This method injects test signals into the closed loop system to independently solve for the voltage and current ...

Blog Post LTspice 

 

LTspice: Simple Steps to Import Third-Party Models

Gabino Alonso - Strategic Marketing Engineer May 3rd 2014
It is possible in LTspice IV to create a new symbol from scratch for a third-party model but who has the time? Follow these easy steps to generate a new symbol for a third-party model defined in a subcircuit (.SUBCKT statement). Open the netlist file that contains the subcircuit definitions in LTspice (File > Open or drag ...

Blog Post LTspice 

 

LTspice: SAR ADC Driver Interface

Kris Lokere - Strategic Applications Manager Apr 3rd 2014
High-performance SAR ADCs can offer amazing dynamic range and linearity at faster and faster sample rates. But how do you design the amplifier and interface at the analog inputs? LTspice IV can help. This video shows how to use LTspice to simulate the analog input interface of high-performance SAR ADCs. We will look at charge ...

Blog Post Video LTspice 

 

A Low Jitter Clock is Required to Evaluate High Resolution ADCs

Guy Hoover - Applications Engineer Mar 3rd 2014
“How bad can the ADC clock be and still get good SNR results?” I’ve never been asked this question directly by a customer but I do periodically get asked about using clock sources that are not appropriate for high resolution ADCs. Usually it involves a function generator which can have jitter up to 1nsRMS. ...

Blog Post PScope 

 

LTspice: Extracting Switch Mode Power Supply Loop Gain in Simulation and Why You Usually Don't Need To

Mike Engelhardt - Mgr. of Simulation Development Mar 3rd 2014
The gain of a negative feedback loop needs to fall with frequency below unity before too much phase shift occurs unless your aim actually is to make an oscillator[1]. This idea can be applied to the stability analysis of a Switch Mode Power Supply(SMPS). Even though a SMPS is an intrinsically non-linear circuit with no small- ...

Blog Post LTspice 

 

LTspice: AC Analysis

Simon Bramble - Field Applications Engineer Feb 13th 2014
Sometimes the frequency response of a circuit is more important than looking at the individual voltages or currents at a specific part of the schematic. LTspice can help you achieve this with its AC analysis function. This video shows you how to perform a basic AC analysis in LTspice as well as point out some capabilities ...

Blog Post Video LTspice 

 

Going Generic

Leo Chen - Applications Engineer Jan 29th 2014
Recently, we have noticed an influx of interest concerning having our Linduino code work with a regular Arduino Uno. Here we will go over the modifications necessary, and the reasons behind these changes. When Linduino was first conceived at Linear, we didn’t start by dreaming about building our own Arduino board. Our ...

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LTspice: Integrating Noise Over a Bandwidth

Gabino Alonso - Strategic Marketing Engineer Dec 19th 2013
LTspice can perform .noise analysis of a circuit, where the noise voltage density (V/√Hz) for 1Hz bandwidth) can easily be plotted for the output noise, input noise or for any noisy component like a resistor, diode or transistor. However, you can also easily integrate noise over a selected bandwidth in a .noise analysis.   To ...

Blog Post LTspice 

 

Coherent Sampling with PScope

Clarence Mayott - Applications Engineer Nov 22nd 2013
The most common problem we encounter in interpreting data from PScope is non-coherent sampling. A non-coherent signal is one in which a complete period is not sampled in the data record.   This means there is a partial period that is sampled (Figure 1).  The non-complete period is translated into frequency spreading ...

Blog Post PScope 

 

PScope Basics

Clarence Mayott - Applications Engineer Nov 8th 2013
Introduction When Linear Technology sends out a high speed ADC demo board we also provide the tools to evaluate that demo board. PScope is Linear Technology’s data collection software—it’s as simple as it is powerful. In order to get the demo board working you need to apply power to the demo board, a clock ...

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LTspice: Stability of Op Amp Circuits

Kris Lokere - Strategic Applications Manager Nov 6th 2013
We all know that feedback circuits can oscillate. We may even know some tricks of how to fix it. But wouldn’t it be nice if our simulation tool could show us exactly what is happening, and why? This video illustrates how to use the .AC analysis to look at open loop gain and phase of operational amplifier feedback circuits ...

Blog Post Video LTspice 

 

LTspice: Computing the Average or RMS Value of a Trace

Gabino Alonso - Strategic Marketing Engineer Nov 6th 2013
The LTspice waveform viewer can integrate a trace to produce the average or RMS value over a given region. To integrate a trace in the waveform viewer: Zoom in to the region of interest. Hold down the control key and click the label of the trace you want to integrate. Based on the physical units of the data trace, ...

Blog Post LTspice 

 

What Is Linduino?

Leo Chen - Applications Engineer Nov 4th 2013
The Linduino development platform consists of an Arduino compatible development board as well as a large library of example firmware. The Linduino One is fully USB isolated and is meant to provide a stable hardware development platform. Example firmware can be downloaded and compiled, giving users a head start in developing ...

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LTspice: Using the .STEP Command to Perform Repeated Analysis

Gabino Alonso - Strategic Marketing Engineer Oct 7th 2013
There are two ways to examine a circuit in LTspice by changing the value for a particular parameter: you can either manually enter each value and then resimulate the circuit to view the response, or use the .step command to sweep across a range of values in a single simulation run.The .step command causes an analysis to be repeatedly ...

Blog Post LTspice 

 

LTpowerCAD: A Design Tool for Switching Regulators

Sam Young - Applications Engineer Oct 1st 2013
Switching power supply design can often be a challenging and time-consuming experience. Typically this requires knowledge of aspects such as control loop compensation, IC operation and capabilities, filtering and even power loss mechanisms related to DC/DC switching regulators. The LTpowerCAD design tool provides recommendations ...

Blog Post Video LTpowerCAD 

 

What Is The LTpowerCAD Design Tool and How Is It Different From LTspice?

Henry Zhang - Applications Engineering Manager Sep 27th 2013
Today’s electronics systems require an increasing number of power rails and supply solutions, with the load range from a few mA for standby supply to over 100A for ASIC or FPGA core voltage regulators. It is important to have the appropriate solutions for the targeted applications and meet specified performance requirements, ...

Blog Post LTpowerCAD LTspice 

 

Meet Linduino

Leo Chen - Applications Engineer Sep 12th 2013
I’ve found that one of the hardest aspect of my job has been to explain what exactly it is that I do for 8,9, 10 hours a day to those coming from a not so technical background. For the past five years, I’ve been an application engineer for Mixed Signal Products here at LTC, and a large portion of my work has been ...

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LTspice: Annotating Schematic & Waverform Plots

Gabino Alonso - Strategic Marketing Engineer Sep 4th 2013
Adding informative comments to a schematic using text is very useful. However, there are times when adding a line, rectangle, circle or arc to a schematic can better illustrate a circuit. A classic example is highlighting a transformer core using two lines. In LTspice these graphical annotations are available under Draw in the ...

Blog Post LTspice 

 

LTspice: Parametric Plots

Gabino Alonso - Strategic Marketing Engineer Aug 6th 2013
Plotting results in LTspice is as easy as clicking on a node to show voltage, or a component to show current—the trace is then displayed in the waveform viewer. In transient analysis, the horizontal axis defaults to showing time, but you can always change the horizontal axis to show other quantities (such as current) to ...

Blog Post LTspice 

 

LTspice: Importing & Exporting PWL Data

Gabino Alonso - Strategic Marketing Engineer Jul 18th 2013
The LTspice waveform viewer is a handy way to perform basic measurements, but there are times when you need to export data from, or import data into LTspice to further evaluate a circuit. To export waveform data to an ACSII text file: Click to select the waveform viewer Choose Export from the File menu. Select ...

Blog Post LTspice 

 

LTspice: Piecewise Linear Functions for Voltage & Current Sources

Gabino Alonso - Strategic Marketing Engineer Jun 10th 2013
Piecewise linear (PWL) functions are used to construct a waveform from a series of straight line segments connecting points defined by the user in LTspice. Since PWL functions are useful in creating custom waveforms, they are typically used in defining voltage or current sources. To add a PWL function to a voltage or current ...

Blog Post LTspice 

 

LTspice: Noise Simulations

Tyler Hutchison - Signal Conditioning Design Engineer May 7th 2013
LTspice can perform frequency domain noise analysis which takes into account shot, thermal and flicker (1/f) noise. The resulting noise density (in units of volts per square root hertz) can then be plotted to aid in circuit analysis and understanding. This video covers how to setup a .noise simulation in LTspice to view both ...

Blog Post Video LTspice 

 

LTspice: Undocumented Shortcuts

Gabino Alonso - Strategic Marketing Engineer May 1st 2013
There are several undocumented shortcuts in LTspice IV that you might find useful: Alt + left-click on a label, V(n008), in the waveform viewer to highlight that particular net in the schematic editor. To route wires at an angle, hold down Ctrl key as you draw them. Text with a preceding underscore character, e.g., “_FAULT”, ...

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LTspice: Keyboard Shortcuts

Gabino Alonso - Strategic Marketing Engineer Apr 15th 2013
Keyboard shortcuts are an alternate way to invoke one or more commands in LTspice that would otherwise only be accessible by clicking through the menu or toolbar. You can view these shortcuts for the schematic editor by choosing: Tools > Control Panel > Drafting Options and clicking Hot Keys. Hot Keys can be reprogrammed ...

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Simulating Power Planes with LTspice

Michael Jones - Applications Engineer Apr 8th 2013
When designing Power Distribution Networks (PDN) it is common to use SPICE models to represent the planes. High-end designs use 2D/3D electronic magnetic modeling tools to extract SPICE models. However, there are times when a simple spice model will suffice, or you may not always have access to very expensive 2D/3D modeling ...

Blog Post LTspice 

 

LTspice: Evaluating Electrical Quantities

Gabino Alonso - Strategic Marketing Engineer Apr 19th 2012
Utilizing LTspice waveform viewer to analyze a circuit and perform basic measurements is very useful. However there are times where you need to evaluate a circuit with a numerical analysis. For these circumstances .MEASURE statements can be very powerful in evaluating user-defined electrical quantities. .MEASURE statements ...

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LTspice: Stepping Parameters

Gabino Alonso - Strategic Marketing Engineer Feb 9th 2012
Plotting voltages or currents in a LTspice simulation is important but so is varying a parameter in a device or model so that you can compare performance and develop your circuit intuition. There are two ways to examine a circuit by changing the value of a parameter. You can either manually enter each value then re-simulate ...

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LTspice: Adding Third-Party Models

Gabino Alonso - Strategic Marketing Engineer Oct 5th 2011
LTspice supplies many device models to include discrete like transistors and MOSFET models. Nevertheless, there are also many third-party models from manufacturers that are available that you could add to your LTspice IV circuit simulations. These third-party SPICE models are described with a .MODEL and .SUBCKT statements. ...

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LTspice: Using Transformers

Gabino Alonso - Strategic Marketing Engineer Aug 25th 2011
Transformers and coupled inductors are key components in many switching regulator designs to include flyback, forward and SEPIC converters. They perform critical function in providing an isolation barrier, enabling high step-down or step-up ratios and accommodating multiple or inverting outputs. Although it is possible to ...

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LTspice: Waveform Viewer

Gabino Alonso - Strategic Marketing Engineer Jul 22nd 2011
LTspice includes an integrated waveform viewer that in combination with the schematic editor provides an easy way to display and review simulation data. This means that if you click on an object in the schematic editor, the voltage on that wire or current through that component will be plotted on a waveform viewer and some ...

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LTspice: Schematic Editor

Gabino Alonso - Strategic Marketing Engineer Apr 28th 2011
Unlike many schematic capture programs, LTspice schematic editor was written explicitly for running SPICE simulations. This means that if you click on an object, the default behavior is to plot the voltage on that wire or current through that component, not select the object for editing. Hence, the first couple of times you ...

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LTspice: Overview

Gabino Alonso - Strategic Marketing Engineer Mar 4th 2011
LTspice is a high performance Spice III simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators. Our enhancements to Spice have made simulating switching regulators extremely fast compared to normal Spice simulators, allowing the user to view waveforms ...

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