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Solutions Search - Low Power Amplifiers (Is < 1mA/amp)

Reference Filter Increases 32-Bit ADC SNR by 6dB

Guy Hoover - Applications Engineer Sep 26th 2017
Design Note DN568: Introduction Attaining optimal SNR performance from an ADC isn’t just a matter of providing a low noise signal to the ADC’s input. Providing a low noise reference voltage is just as important. While reference noise has no effect at zero-scale, at full-scale any noise on the reference will be visible ...

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Precision Ultralow Power High Side Current Sense

Catherine Chang - Applications Engineer Sep 19th 2017
Design Note 1045: Introduction Precision high side measurement of microamp currents requires a small value sense resistor and a low offset voltage, ultralow-power amplifier. The LTC®2063 zero-drift amplifier has a maximum input offset voltage of just 5µV and draws just 1.4µA making it a great choice for building ...

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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 ...

Blog Post LTspice 

 

Lower Power Op Amp: Low Noise Reference, Utility Sine Wave

Catherine Chang - Applications Engineer
Philip Karantzalis - Senior Apps Eng
Aaron Schultz - Applications Manager Signal Conditioning
May 22nd 2017
Design Note DN1042: Introduction Our op amp family has expanded with industryleading speed versus supply current. The LTC®6258/ LTC6259/LTC6260 family (single, dual, quad) provides 1.3MHz at a super low 20μA supply current, with 400μV maximum offset voltage and rail-to-rail input and output. In combination with a ...

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Lower Power Op Amp: Utility Sine Wave

Aaron Schultz - Applications Manager Signal Conditioning
Philip Karantzalis - Senior Apps Eng
Catherine Chang - Applications Engineer
May 22nd 2017
Design Note DN564: Introduction Our op amp family has expanded with industryleading speed versus supply current. The LTC®6258/ LTC6259/LTC6260 family (single, dual, quad) provides 1.3MHz at a super low 20μA supply current, with 400μV maximum offset voltage and rail-to-rail input and output. In combination with a 1.8V ...

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Low Power Op Amp: Low Power Filter, Headphone Driver Revisited

Aaron Schultz - Applications Manager Signal Conditioning May 18th 2017
Design Note DN563: Introduction A new family of op amps features industry leading speed versus supply current. The LTC6261/LTC6262/ LTC6263 family (single, dual, quad) provides 30MHz at a low 240μA supply current, with 400μV maximum offset voltage and rail-to-rail input and output. In combination with 1.8V to 5.25V supply, ...

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Hybrid Wide Dimming Ratio Linear LED Current Controller Using LT8614 & LT3083/LT6015

Tom Mosteller - Field Applications Engineer Oct 17th 2016
Many applications for LED illumination require wide dimming ratios. This can be accomplished simply via an adjustable current source as show below.  The current source can be varied by a number of different means, and a large LED current range can be achieved. The primary problem with this technique is that the power dissipation ...

Blog Post Circuit LTspice 

 

Op Amp Precision Positive & Negative Clipper using LT6015/LT6016/LT6017

Tom Mosteller - Field Applications Engineer
Aaron Schultz - Applications Manager Signal Conditioning
Oct 3rd 2016
It can be a challenge to match the voltage range of an analog signal to the input range of an analog to digital converter (ADC). Exceeding the ADC’s input range will give an incorrect reading, and if the input goes far enough beyond the power supply rails substrate currents can flow into the ADC which can cause latch up ...

Blog Post Circuit LTspice 

 

LTC2387 Drivers Part III: Trans-Impedance Amplifier/Driver

Derek Redmayne - Staff Scientist Sep 8th 2016
This is unabashedly a classic case of what marketing calls “a solution looking for a problem”. It is an example of how the full SNR of the LTC2387 may be realized for a real world signal. Most signals originating in low level circuitry, in sensors, or in the real world, will require significant gain to develop 8Vp-p ...

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Low Power, Precision Op Amp Simplifies Driving of MUXed ADCs

Guy Hoover - Applications Engineer Oct 2nd 2015
Design Note 1034: Introduction The high speed op amps required to buffer a modern 16‑/18-bit analog-to-digital converter (ADC) typically dissipate as much power as the ADC itself, often with a maximum offset spec of about 1mV, well beyond that of the ADC. If multiple multichannel ADCs are required, the power dissipation can ...

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Injection-Lock a Wien-Bridge Oscillator

Glen Brisebois - Applications Engineer - Signal Conditioning Sep 22nd 2015
I recently had the opportunity to investigate a new micropower 6-MHz LTC6255 op amp driving a 12-bit, 250k sample/sec LTC2361 ADC. I wanted to acquire the FFT of a pure sinusoid of about 5 kHz. The problem is that getting the FFT of a pure sinusoid requires, well, a pure sinusoid. Most programmable signal generators, however, ...

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Signal Conditioning for High Impedance Sensors

Glen Brisebois - Applications Engineer - Signal Conditioning Sep 22nd 2015
Abstract Dealing with high impedance sources and maintaining high impedance inputs without compromising reliability has its own set of challenges. This article offers qualitative and quantitative discussions of issues associated what high impedence circuits, what types of sensors are high impedance, and what devices are available ...

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Positive to Negative Converter with Variable Output Using LTC3630 and LT6015/LT6016

Philip Lane - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Sep 1st 2015
There was a window of time in the 1950s and early ’60s when negative voltage rails were commonplace, when germanium PNP transistors were prevalent—like those used in an old “transistor radio”, now worth a fortune on Ebay. Nowadays, NPN transistors are more prevalent, since they basically work ...

Blog Post Circuit LTspice 

 

Paralleling Amplifiers Improves Signal-to-Noise Performance

Kevin B. Scott - Senior Strategic Marketing Engineer Jul 9th 2015
Dealing with low amplitude signals can be challenging.  In order to differentiate between the low level signal and the noise contributed by surrounding circuitry, we typically use gain to amplify the signal above the noise floor.  However, a standard amplifier configuration multiplies the input signal, the input noise, ...

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Micropower Op Amp Drives 8-Channel 18-Bit Simultaneous Sampling ADC without Compromising Accuracy or Breaking the Power Budget

Guy Hoover - Applications Engineer Jun 23rd 2015
Design Note 541: Introduction The op amps used to drive 18-bit analog-to-digital converters (ADCs) typically draw as much supply current as the ADC itself, often with a maximum offset spec that is well above that of the ADC. If multiple ADC channels are required, the power dissipation from these drivers quickly rises to unacceptable ...

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Paralleling Amplifiers Increases Output Drive

Apr 1st 2015
There are several circuit techniques that increase the output drive capability of an amplifier. One method uses external bipolar transistors as a push-pull circuit to provide additional drive. Another method uses two different amplifiers in a composite amplfier configuration as detailed in Application Note 21 to leverage ...

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Increase Amplifier Output Drive Using a Push-Pull Amplifier Stage

Feb 17th 2015
Many portable circuits require precision measurement capability along with low power operation to minimize current and battery drain. When searching for an amplifer with these requirements, it may be relatively easy to meet the low power and precision requirements, but the drive current may not be adequate for these low power ...

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Precision Op Amp Enables Fast Multiplexing at Low Power

Kris Lokere - Strategic Applications Manager Jan 23rd 2015
Introduction If you are designing a system that measures a number of analog voltages, but not all at the same time, you can reduce downstream circuitry by multiplexing the measurements into a single output signal, then serially process and digitize the original voltage levels using shared components. The benefit is that the ...

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Robust High Voltage Over-The-Top Op Amps Maintain High Input Impedance with Inputs Driven Apart or When Powered Down

Glen Brisebois - Applications Engineer - Signal Conditioning Nov 5th 2014
Introduction Linear Technology’s Over-The-Top op amps have an input stage topology that allows them to operate closed loop well above the positive supply rail. The inputs remain high impedance when split apart in voltage and also when shut down or with complete loss of power supply. They are indispensable in robust ...

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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