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Solutions Search - Low Bias Current Amplifiers (Ib < 100pA)

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 ...

Blog Post 

 

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 ...

Blog Post 

 

DC2369A - DC2369A Low Power Wireless Current Sense

Aug 30th 2017
The DC2369A demo circuit is a reference design that implements a wireless current sense solution using Analog Device's low power integrated circuits. The only external connection needed is the current to be measured, allowing this circuit to be inserted at any voltage level or isolation level. The design combines components ...

Demo Board 

 

LTC2063 Micropower Precision Oxygen Sensor

Jul 27th 2017
This low power precision gas sensor circuit operates in an oxygen level range of 0% to 30%, with a nominal output of 1V in normal atmospheric oxygen concentrations (20.9%) when the gas sensor has been fully initialized. Total active power consumption is less than 2.1μA on a single rail supply. Since ...

Circuit LTspice 

 

LTC2063 RTD Sensor with ±1°C Precision

Jul 27th 2017
This low power platinum resistance temperature detector (RTD) sensor circuit draws only 35μA total supply current on a minimum 2.6V rail, and is accurate to within ±1°C at room temperature, including all error intrinsic to the Vishay PTS Class F0.3 Variant RTD. It covers the temperature ...

Circuit LTspice 

 

Micropower Zero-Drift Amplifier Improves Circuit Performance

Andrew Roberts - Design Engineer Jul 10th 2017
This video explores the superior performance achieved with the LTC2063 zero-drift amplifier in a wide variety of low power applications. The LTC2063 enables precision measurement at extremely low power levels. The LTC2063 operates from 1.7V to 5.25V and features a shutdown mode which is optimized for battery-powered and duty-cycled ...

Video 

 

Industry’s Lowest Power Zero-Drift Op Amp Consumes only 1.3μA

Jul 10th 2017
MILPITAS, CA and NORWOOD, MA – July 10, 2017 – Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC2063 zero-drift op amp which draws just 1.3μA typ (2μA max) on a 1.8V supply. This micropower amplifier maintains uncompromised precision: maximum input offset voltage ...

Press Release 

 

DC2246B - LT3042EDD Demo Board | Ultralow Noise, Ultrahigh PSRR RF LDO, 3.8V ≤ VIN ≤ 20V, VOUT = 3.3V @ 200mA

Mar 28th 2017
DC2246B is a linear regulator demonstration circuit featuring the LT®3042EDD, which is a 200mA, ultralow noise, and ultrahigh power supply rejection ratio (PSRR) RF low dropout (LDO) regulator with programmable current limit. DC2246B operates over an input voltage range of 3.8V to 20V and is configured for 3.3V at its output. ...

Demo Board 

 

DC2414A - Un-Populated Demonstration Circuit; Supports 3 Channels of LTC6268 & LTC6268-10/LTC6226X

Jan 3rd 2017
Demonstration Circuit 2414A has layouts for three channels of SOT-23 transimpedance amplifiers. Each of the three layouts applies different techniques achieving various parasitic feedback capacitances (CF). The upper channel, U3, assumes a low Transimpedance gain, has a parasitic CF of 0.1pF, and provides a footprint for an ...

Demo Board 

 

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 ...

Blog Post 

 

LTC6244 High Speed Peak Detector

Hassan Kelley - Field Applications Engineer
Gabino Alonso - Strategic Marketing Engineer
Aug 1st 2016
Introduction Peak detectors capture the extrema of the voltage signal at its input. A positive peak detector captures the most positive point of the input signal and a negative peak detector captures the most negative point of the input signal. Ideally the output of the peak detector circuit tracks or follows the input voltage ...

Blog Post Circuit LTspice 

 

How to Drive the LTC2387 (Part 1): Signal Applications to 5MHz that Require Low Inter-Modulation Distortion

Derek Redmayne - Staff Scientist May 13th 2016
The biggest challenge in driving a 15Msps, 18-bit ADC with an 8Vp-p input range is the lack of integrated amplifiers with adequate bandwidth, low noise, and the required output excursion. There are low-noise, high-BW amplifiers than can produce 2VPP. There are low speed amplifiers than can produce 8VPP. For low distortion beyond ...

Blog Post 

 

LTC6268-10 Oscilloscope Differential Probe

Dec 1st 2015
The LTC6268-10 is a single 4GHz FETinput operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It is a decompensated op ...

Circuit LTspice 

 

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 ...

Blog Post 

 

4GHz Amplifier Achieves <1pA Input Bias Current over -40°C to 85°C Temperature Range

May 13th 2015
MILPITAS, CA - May 13, 2015 - Linear Technology announces the LTC6268-10 single and dual LTC6269-10 4GHz FET-input op amps for high dynamic range and high speed transimpedance amplifier (TIA) applications. These new decompensated amplifiers extend the speed and dynamic range capabilities of this ultralow bias current op amp ...

Press Release 

 

LTC6269-10 20kΩ Gain 210MHz Transimpedance Amplifier

Apr 7th 2015
The LTC®6268-10/LTC6269-10 is a single/dual 4GHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input-referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, and high-impedance sensor amplifiers. It ...

Circuit 

 

LTC6268 20kΩ Gain 65MHz Trans-Impedance Amplifier

Apr 7th 2015
The LTC®6268/LTC6269 is a single/dual 500MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low inputreferred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance sensor ...

Circuit 

 

Avoid Amplifier Output Driver Saturation When Using pA Bias Current Amplifiers with High Source Impedance Sensors

Jon Munson - Applications Engineer
Kevin B. Scott - Senior Strategic Marketing Engineer
Mar 26th 2015
Need for Low Bias Current Amplfiers When taking sensor measurements, the type of sensor excitation used varies greatly; it can be a DC signal, an AC signal, a voltage source, a current source or a pulsed source to name a few. When using current source excitation or when using a high impedance sensor, the amplifier's bias current ...

Blog Post 

 

High Bandwidth, Very Low Input Bias Current Op Amp

Roger Kidson - Product Evaluation Engineer Mar 11th 2015
The LTC6268 is a new op amp with a unique combination of bandwidth, input and output characteristics. It has a gain bandwidth of 500MHz with a typical input bias current of only 3 femptoamps. The input capacitance is 0.45pF and the output can drive a 200Ω load. This combination of features can bring new levels of performance ...

Video 

 

Transimpedance Amplifier Noise Considerations

Feb 18th 2015
The LTC6268 and LTC6269 is a single/dual 500MHz FET-input operational amplifier with extremely low input bias current and low input capacitance. It also features low input referred current noise and voltage noise making it an ideal choice for high speed transimpedance amplifiers, CCD output buffers, and high-impedance ...

Blog Post 

 

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 

 

Low Power Precision Op Amp Allows Fast, Accurate Multiplexing

Kris Lokere - Strategic Applications Manager Nov 19th 2014
If you need to measure many analog voltages, but not necessarily all at the same time, then a common approach is to multiplex these signals together into one output signal, so that you can then process and digitize each of these original voltage levels one at a time using shared circuitry. But doing this right requires some ...

Video 

 

Femtoamp Bias Current Op Amps Achieve 500MHz Gain Bandwidth for TIA & Buffer Applications

Sep 29th 2014
MILPITAS, CA - September 29, 2014 - Linear Technology announces the LTC6268 and LTC6269, FET-input single and dual op amps, which deliver outstanding performance for high speed and high dynamic range transimpedance amplifier (TIA) and buffer applications. With just 3fA bias current at 25°C and 4pA max over the entire -40°C ...

Press Release 

 

Precision Op Amps Operate on 140V Supply

Aug 4th 2014
MILPITAS, CA - August 4, 2014 - Linear Technology announces the LTC6091 and LTC6090-5, additions to the LTC6090 family of precision operational amplifiers which operate on a supply voltage up to 140V (±70V). The dual LTC6091 features separate output disable pins, making it useful in high voltage multiplexed applications. The ...

Press Release 

 

LTC6091 Multiplexer Application

Jul 14th 2014
The LTC®6091 is a dual, high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6091 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. ...

Circuit 

 

LTC6091 High Voltage Analog MUX

Jul 14th 2014
The LTC®6091 is a dual, high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6091 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. ...

Circuit 

 

LTC6091 Wide Common Mode Range 10x Gain Instrumentation Amplifier Typically <1mV Input-Referred Error

Jul 14th 2014
The LTC®6091 is a dual, high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6091 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. ...

Circuit 

 

140V CMOS Op Amp with Rail-to-Rail Output & pA Inputs

Arnold Nordeng - Design Section Leader - Signal Conditioning Jun 26th 2014
The LTC6090 high voltage CMOS op amp is the highest voltage monolithic op amp in the industry. It has a number of unique characteristics not found in other CMOS op amps. Unlike other CMOS amplifiers whose fine transistor geometries limit power supply operation to 5V, the LTC6090 is built on Linear Technology’s proprietary ...

Video 

 

60V Zero-Drift Operational Amplifier with 220nVP-P Noise Achieves Widest Dynamic Range

Aug 22nd 2013
MILPITAS, CA – August 22, 2013 – Linear Technology introduces the LTC2057HV, a zero-drift amplifier featuring self-calibrating circuitry that provides high DC precision and stability over changes in temperature, time, input range and supply voltage. With 5µV input offset voltage, 0.025µV/°C offset drift and 220nVP-P low ...

Press Release 

 

High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC

Jon Munson - Applications Engineer Apr 1st 2013
Introduction Accurately measuring voltages requires minimizing the impact of the instrument connection to the tested circuit. Typical digital voltmeters (DVMs) use 10M resistor networks to keep loading effects to an inconspicuous level, but even this can introduce significant error, particularly in higher voltage circuits that ...

Blog Post 

 

DC1979A - LTC6090 | 140V RROut Op Amp Demo Board

Feb 5th 2013
DC1979A - Demo Board for:LTC6090 - 140V CMOS Rail-to-Rail Output, Picoamp Input Current Op Amp ...

Demo Board 

 

Low Noise Single Supply Photodiode Amplifier

Glen Brisebois - Applications Engineer - Signal Conditioning Feb 4th 2013
Low Noise Single Supply Photodiode Amplifier Figure 1 shows the LTC6252 applied as a high performance transimpedance amplifier for a photodiode. A low noise JFET acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. Transimpedance gain is set by feedback resistor R1 to 1MΩ. R4 and ...

Blog Post 

 

140V Precision Op Amp Features 3pA Bias Current, 3.5μVP-P Noise for High Gain Applications

Jan 30th 2013
MILPITAS, CA – January 30, 2013 – Linear Technology announces the LTC6090, a precision operational amplifier that operates on a supply voltage up to 140V (or ±70V). Its combination of rail-to-rail output, 3pA (typical) input bias current, 1.6mV maximum input offset voltage and 3.5µVP-P low frequency noise delivers the ...

Press Release 

 

Extended Dynamic Range 1MΩ Transimpedance Photodiode Amplifier

Oct 30th 2012
The LTC6090 is a high voltage precision operational amplifier. The low noise, low bias current input stage is ideal for high gain configurations. The LTC6090 has low input offset voltage, a rail-to-rail output stage, and can be run from a single 140V or split ±70V supplies. ...

Circuit 

 

DC417B - DIP8, MS8, S8, SOT23-6 | Multi-Footprint General Purpose Board for Single Op. Amp

Feb 1st 2012
DC417B - Demo Board ...

Demo Board 

 

700kHz, 1MΩ Single Supply Photodiode Amplifier

Oct 2nd 2009
The measured output noise for this circuit was 153uVrms measured on a 1MHz bandwidth. Supply current was a low 2.2mA. ...

Circuit 

 

Tiny Low-Cost Rail-to-Rail Amplifiers Deliver Speed & Precision

Nov 13th 2007
MILPITAS, CA - November 13, 2007 - Linear Technology Corporation introduces the LTC6087 and the LTC6088, low cost dual and quad amplifiers, which combine speed, precision and low power in a tiny DFN package. Featuring rail-to-rail input and output stages, these amplifiers achieve 750uV (max) offset voltage, 14MHz GBW and 1pA bias ...

Press Release 

 

Sub-Microvolt Drift 3.5MHz CMOS Amplifiers Feature 1pA Bias Current and Low Noise

Sep 25th 2007
MILPITAS, CA – September 25, 2007 – Linear Technology Corporation introduces the LTC6081 and the LTC6082: CMOS Op-Amps that push the limits of precision with 3.5MHz gain-bandwidth and less than 90uV offset over the entire -40°C to +125°C temperature range. Featuring rail-to-rail input and output stages, the dual LTC6081 ...

Press Release 

 

Single Supply Shock/Vibration Sensor Amplifier

Sep 5th 2007
The LTC6087/LTC6088 are dual/quad, low noise, low offset, rail-to-rail input/output, unity-gain stable CMOS operational amplifiers that feature 1pA of input bias current. A 14MHz gain bandwidth and 7.2V/μs slew rate, combined with low noise (10nV/√Hz) and a low 0.75mV offset, make the LTC6087/LTC6088 useful in a variety of ...

Circuit 

 

Precision Nanoamp Bidirectional Current Source

Aug 6th 2007
This circuit sources and sinks just nanoamps of current with precision due to the low input bias current of the CMOS op amps. A buffered difference amplifier and an integrator force the voltage across a 10Megaohm set resistor to be 1/1000 of the control input voltage in either polarity. ...

Circuit 

 

LTC6081 Single Supply Strain Gauge Amplifier

Aug 6th 2007
A dual CMOS amplifier with low supply voltage operation and rail to rail input and output performance makes single supply operation easy. This circuit provides a gain of 1001 to the small differential input signal from a low voltage strain gauge bridge transducer. High input impedance allows for high valued input resistors to ...

Circuit LTspice 

 

LTC6081 Shock Sensor Amplifier (Accelerometer)

Aug 6th 2007
A shock sensor is a capacitive piezoelectric element which generates a charge under physical acceleration. This charge can be converted to a voltage and filtered using high valued resistors and a high input impedance CMOS amplifier such as the LTC6081. This circuit has a gain of 100 and output 109mV per g of acceleration. ...

Circuit LTspice 

 

LTC6081 Two Op Amp Instrumentation Amplifier

Aug 6th 2007
Instrumentation amplifiers present a high input impedance to a differential input signal source and provide a single ended output. This circuit uses the non-inverting inputs of each amplifier of the dual LTC6081 for the differential input terminals. The gain is set with external resistors to over 1000. A CMRR trim cancels the ...

Circuit LTspice 

 

Low Side Current Sense

Aug 6th 2007
Sensing the amount of current through a load on the low side has the disadvantage of raising the return connection to the load from ground. The advantage of such an approach is that it is very easy to implement using a basic non-inverting gain stage. The LTC6081 operates linearly down to ground also in this single supply example. ...

Circuit 

 

Reference Buffer

Jan 10th 2007
The control voltage, Vin, is converted to a charge on a capacitor that is referenced to ground. This charge is transferred to place a differential voltage across the output current programming resistor. The output current then flows into a ground referenced load for a precision single supply circuit without the need for a voltage ...

Circuit 

 

LTC6240 Piezoelectric Shock Sensor Amplifier

Jan 10th 2007
A piezoelectric shock sensor generates a charge when physically accelerated. This charge is transferred to the smaller feedback capacitor. In this circuit a gain of 100 is given to the sensor’s open circuit voltage. ...

Circuit 

 

LTC6240 Low Noise 1M Trans-Impedance Amplifier

Jan 10th 2007
By using a 10Megaohm resistor, with a noise of 400nV/rtHz, for transimpedance gain and then attenuating the signal by 10 results in an equivalent gain of 1Megaohm with only 40nV/rtHz of noise. This is less than 1/3 the noise of a single stage TIA with a 1Megaohm resistor. ...

Circuit 

 

1.6V High Precision Op Amps Consume Less then 1uA

Sep 28th 2006
MILPITAS, CA - September 28, 2006 - Linear Technology Corporation announces a new family of ultralow power op amps that set a new standard for precision low voltage operation and tiny footprint. The LT6003 (single), LT6004 (dual) and LT6005 (quad) amplifiers draw less than 1uA and operate from 1.6V to 16V. With input offset ...

Press Release 

 

Low Noise Low Power DC Accurate Single Supply Photodiode Amplifier

Sep 21st 2006
A low noise JFET Q1 acts as a current buffer, with R2 and R3 imposing a low frequency gain of approximately 1. ...

Circuit 

 

Very Low Noise Large Area Photodiode Amplifier

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. AC coupling a bootstrap JFET across ...

Circuit 

 

Small Area Photodiode in Normal TIA Configuration

Aug 22nd 2006
Small area photodiodes have low capacitance. To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise. The total input capacitance from the amplifier in this circuit is the ...

Circuit 

 

Low Noise Fully Differential Buffer/Amplifier

Aug 22nd 2006
Useful in RFID baseband signal processing is a differential amplifier with an input impedance set to match the differential output impedance of a RF demodulator. The differential input impedance is 2*Rin and the gain is Rg/Rin. Capacitors Cf and Cin can be used to set the bandwidth of the amplifier. For DC biasing the common ...

Circuit 

 

LTC6244 Low Noise AC Difference Amplifier

Aug 22nd 2006
Piezoelectric and LVDT (Linear Variable Differential Transformer) sensors provide differential ac output signals. In addition to a standard difference amplifier a secend amplifier can be used as a dc servo amplifier to force an output dc bias potential in single supply applications. This difference amplifier is dc coupled but ...

Circuit LTspice 

 

Large Area Photodiode Bootstrapping

Aug 22nd 2006
Large area photodiodes come with a large capacitance, typically on the order of 3000pF or larger. This capacitance to ground at the input of a transimpedance amplifier has a significant effect on the output noise of the circuit as the noise gain increases dramatically at higher frequencies. The addition of a low noise JFET ...

Circuit 

 

Wide Bandwidth Photodiode Amplifier

Aug 22nd 2006
Wide bandwidth performance from a small photodiode requires minimizing the total input capacitance. In this circuit the amplifier's differential input capacitance is bootstrapped by the feedback with R1 and R2. Choosing the amplifier input that is at the corner of the package for the dual LTC6244 also minimizes pin-to-pin capacitance. ...

Circuit 

 

Tiny 50MHz CMOS Op Amp Boasts Low Noise and High Precision

Aug 17th 2006
MILPITAS, CA - August 17, 2006 - Linear Technology Corporation announces the latest addition to its family of low noise, precision CMOS op amps. With a gain bandwidth of 50MHz and input characteristics that challenge precision bipolar amplifiers, the LTC6244 dual op amp offers breakthrough performance that no other amplifier ...

Press Release 

 

LTC6078/79 - 50uA CMOS Amplifier Equals Best Bipolar Op Amps with 0.7uV/°C Drift

Sep 12th 2005
MILPITAS, CA - September 12, 2005 - Linear Technology Corporation announces a new family of CMOS amplifiers that delivers extraordinary DC precision at the lowest possible supply current. With input DC characteristics similar to the best precision bipolar amplifiers, the LTC6078 dual and LTC6079 quad op amps offer a breakthrough ...

Press Release 

 

Six Decade Current Sensing Log Amplifier

Aug 16th 2005
The low pA's of bias current of CMOS amplifiers make them suitable for high input impedance current sensing applications. By taking advantage of the logarithmic relationship of a transistor base-emitter voltage to it's collector current a very wide range of measured input current can be converted to a voltage. In this circuit ...

Circuit 

 

Accelerometer Signal Conditioner

Aug 16th 2005
A piezoelectric accelerometer responds to any physical movement by generating a charge proportional to the acceleration of the movement. This sensor has a capacitance of 750pF which produces a charge of 60pC per g of gravitational force. This charge is transferred to the 1000pF feedback capacitor for an output of 60mV/g. ...

Circuit 

 

LTC6078 Precision Ground Referenced Voltage Controlled Current Source

Aug 16th 2005
The control voltage, Vin, is converted to a charge on a capacitor that is referenced to ground. This charge is transferred to place a differential voltage across the output current programming resistor. The output current then flows into a ground referenced load for a precision single supply circuit without the need for a voltage ...

Circuit 

 

Micropower Photodiode Amplifier

Aug 16th 2005
This is a basic photodiode amplifier which converts the tiny current output by the diode in response to light intensity to a buffered low impedance voltage source. CMOS amplifier's allow for the use of large feedback resistors and add very little input bias error current. For this Infra-Red diode the output changes 600mV for ...

Circuit 

 

LTC6078 60Hz Notch Filter

Aug 16th 2005
High input impedance amplifiers are ideal for buffering high impedance networks. Here a twin-T notch filter is shown to reject 60Hz signal content by more the 60dB. Small size, low valued capacitors can be used at such a low frequency with high valued resistors when using a CMOS op amp. ...

Circuit LTspice 

 

2.7V to 5.5V Precision High Side Current Sense

Aug 16th 2005
This high side current sense amplifier works down to 2.7V. Even with such a low supply voltage, accuracy of the voltage sensed across resistor Rs is preserved due to the very low voltage offset error of the LTC6078 amplifier (7uV typical). ...

Circuit 

 

LTC6078 pH Probe Amplifier

Aug 16th 2005
pH Probe amplifiers require buffer amplifiers with an input impedance greater than 10^13 ohms. Without loading the probe, an output of approximately 60mV/pH unit is produce. The thermistor is added to provide first order compensation for the inherent temperature coefficient of the pH probe output. ...

Circuit LTspice 

 

Reduced Power Infra-Red Diode Driver

Aug 16th 2005
Infra-Red LEDs can be used as continuously operating beams of light. Sensing a break in the path of light between the source and a photodiode receiver is often used in safety and alarm systems. To extend the run-time of the light source, the diode conducts the minimum current necessary, in this case 10mA. Controlling the duty ...

Circuit 

 

Thermocouple Thermometer with Cold Junction Compensation

Aug 16th 2005
The LTC2997 is a high-accuracy analog output temperature sensor. It converts the temperature of an external sensor or its own temperature to an analog voltage output. A built-in algorithm eliminates errors due to series resistance between the LTC2997 and the sensor diode. ...

Circuit 

 

Low Offset 18MHz CMOS Amplifiers Boast Unprecedented Low Noise

Jul 11th 2005
MILPITAS, CA - July 11, 2005 - Linear Technology Corporation announces a new class of CMOS amplifiers with voltage noise like bipolar amplifiers. Generally known for their low input bias current, CMOS amplifiers are inherently noisier than bipolar designs. The LTC6241 dual and LTC6242 quad amplifiers address this fundamental ...

Press Release 

 

Ultra-Low Noise 1Mohm 150kHz Photodiode Amplifier

Jun 27th 2005
The low current noise of the LTC6242 makes the noise of this circuit dominated by the 1Mohm resistor used to convert the photodiode current to a voltage. ...

Circuit 

 

Low Noise Non-Inverting Shock Sensor Amplifier

Jun 27th 2005
The shock sensor charge is converted to a voltage and amplified with a precision resistor ratio for gain accuracy. Paralleling amplifiers reduces noise. ...

Circuit 

 

Single Ended Input-Differential Output Amplifier

Jun 27th 2005
A dual amplifier package can is configured to convert a single ended ground reference input signal to a differential output signal. Low bias current allows for a high input impedance of 200Kohm and the tight offset matching of the amplifiers provides a differential output dc offset of only 40uV. ...

Circuit 

 

Paralleling Amplifiers to Reduce Noise

Jun 27th 2005
In high gain circuits noise reduction is an important consideration. Paralleling four amplifiers will reduce the total noise of the circuit by a factor of two. The output noise of each amplifier, enOUTx, is attenuated by four and summed at the output terminal. Since noise from uncorrelated sources is summed in RMS fashion the ...

Circuit 

 

Precision Sample and Hold Amplifier

Sep 3rd 2004
CMOS amplifiers are very good for use in Sample-and-Hold circuits because the pA's of bias current does not drain off charge held on the hold capacitor. A dual amplifier can be used to buffer the input signal and also the hold capacitor. The slew rate of the circuit is limited by the output current limit of the input amplifier ...

Circuit 

 

LTC2054 Ultra-Precision, Wide Dynamic Range 10Hz Bandwidth Photodiode Amplifier

Jan 20th 2004
The low input bias current and input noise current, combined with low voltage offset, provide a precision signal monitor. A high degree of input sensitivity is provided to the circuit by the large dynamic range, characterized by low input offset and high DC gain of the LTC2054. ...

Circuit 

 

LTC6081/LT1025 Type K Thermocouple Signal Conditioner with ±350V Protection from Accidental Contact and Cold Junction Compensation

Dec 9th 2003
A high input impedance amplifier permits the use of large valued input resistors and retains signal accuracy. This is very useful for protecting both the amplifier and cold junction compensator in thermocouple applications as the sense element can often be inadvertently connected to destructive voltage potentials. The 1MΩ ...

Circuit 

 

Precision Photodiode Amplifier

Feb 1st 2001
The LT1880 provides a high degree of precision with very low bias current (IB = 150pA typical). Total output offset is below 262mV, worst-case, over temperature (0°C to 70°C). With a 5V output swing this implies a minimum 86dB dynamic range. ...

Circuit 

 

40nVpp Noise, 0.05uV/C Drift, Chopped FET Amplifier

Jan 30th 2001
For very high precision low frequency applications, chopping the dc input signal to create an ac signal and then synchronously demodulating the signal to restore the dc value eliminates all static dc errors of the components used. This is a high gain (Av=1001) example with excellent low offset voltage and drift with temperature ...

Circuit 

 

Paralleled Voltage Regulators with Balanced Load Sharing

Jul 15th 1999
Paralleling voltage regulators to provide mode load current is a common technique. Forcing the amplifiers to share the load current equally is called ballasting. Using a precision low offset voltage amplifier to sense the output current from each regulator requires just milli-ohms of resistance, typically just a pcb circuit ...

Circuit 

 

Relative Humidity Sensor

Mar 2nd 1999
This sensor is a capacitive element that changes value with humidity. By charging the sensor with a fixed current for a fixed time interval, a voltage is developed that is directly proportional to the sensor capacitance value. ...

Circuit 

 

LT1792/LT1464 Low Noise Hydrophone Amplifier with DC Servo

Nov 26th 1996
These op amps are best used with very high impedance transducers. The low noise hydrophone amplifier in this figure is an application where the LT1792 excels. The AC current output of the hydrophone is converted to a voltage output by the 100M input resistor (R8). This signal is amplified by the R3/R2 ratio. DC leakage currents ...

Circuit LTspice 

 

Logging Photodiode JFET Amplifier with 1pA Input Bias Current

Jul 1st 1996
The 1pA input bias current contributes only 0.4fA/rtHz of current noise or 0.4nV/rtHz voltage noise with a 1Mohm source impedance. Photodiode current is converted to a voltage by the first op amp and D1 and amplified by the first, second and third logarithmic compression amplifiers. ...

Circuit 

 

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