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Solutions Search - Operational Amplifiers (Op Amps)

LTC6258 Low Noise Reference Use LT6656 for a Low Current Starting Reference

Aug 30th 2017
The LT6656 is a 1µA precision series voltage reference. Yet with low power comes low drive current capability and higher noise. The LTC6259 can be used as a buffer that follows a filter to enhance the utilization of the LT6656 in low power applications. Figure 5a shows such a configuration. First a very low cutoff frequency ...

Circuit LTspice 

 

LTC6258 Low Power Squarewave - Sinewave Oscillator

Aug 30th 2017
A low power sine wave generator can be derived by driving a square wave into the bandpass filter. A complete schematic is shown in Figure 4a. The LTC6992-1 easily configures as a 50% duty cycle 10kHz square wave, and can drive the relatively benign loading seen in the bandpass filter. Figures 4b and 4c show the LTC6992-1 output ...

Circuit LTspice 

 

LTC6258 LED Driver with Self-Oscillation

Aug 30th 2017
The circuit above combines edge detection with use of the shutdown pin of the LTC6259. R2 and R3 bring in a divided down copy of the supply voltage as a reference into the positive terminal. The op amp forces this voltage on the sense resistor RSENSE in “LED ON” operation. In that sense this circuit is similar to ...

Circuit LTspice 

 

LTC6258 Lower Power LED Driver with Voltage Command

Aug 30th 2017
Figure above shows a voltage controlled LED drive circuit. When VIN is at 0V, the op amp supply current is nominally 20μA. The offset, for example, could be 450µV, appears across R1, inducing a 0.45mA current in the LED. Some applications want a guaranteed zero LED current at VIN = 0, and this is the purpose of R5. ...

Circuit LTspice 

 

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 

 

LT6018 Low Noise, High CMRR Instrumentation Amplifier

Jun 14th 2017
The LT®6018 is a 33V precision operational amplifier with excellent noise performance. With 0.1Hz to 10Hz noise of only 30nVP-P, the LT6018 is an outstanding choice for applications where 1/f noise impacts system performance. The LT6018 has excellent DC performance with a maximum offset voltage of 50μV and a maximum offset ...

Circuit LTspice 

 

LT6018 Low Noise Precision Current Monitor

Jun 14th 2017
The LT®6018 is a 33V precision operational amplifier with excellent noise performance. With 0.1Hz to 10Hz noise of only 30nVP-P, the LT6018 is an outstanding choice for applications where 1/f noise impacts system performance. The LT6018 has excellent DC performance with a maximum offset voltage of 50μV and a maximum offset ...

Circuit LTspice 

 

LT1997-3 - Single Supply Current Sense

Jun 14th 2017
Sense resistors R1 converts a current into a voltage. This voltage is buffered (gain of 1) from the input to the output in this amplifier. V1 tests the circuit for response to common mode variation. A simulation will show that the output voltage variation due to the common mode voltage V1 is very small.     The ...

Circuit LTspice 

 

LT1997-3 - Conversion of Single Ended Pulse To Differential Output

Jun 14th 2017
This circuit combines the LT®1997-3 with a high speed amplifier to convert a single-ended signal to differential with a common-mode offset. Extra compensation capacitors C1 and C2 help to shape the final response. Taking higher gain from the LT1997-3 will eliminate the need for these capacitors.     The LT1997-3 ...

Circuit LTspice 

 

LTC6261 Audio Headphones Bridge Driver

May 22nd 2017
The LTC®6261/LTC6262/LTC6263 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, and rail-to-rail inputs and outputs. They are unity gain stable with capacitive loads up to 1nF. They feature 30MHz gain-bandwidth product, 7V/μs slew rate while consuming only 240μA of supply current ...

Circuit LTspice 

 

LTC6261 Second Order Bessel Filter

Jan 17th 2017
The LTC®6261/LTC6262/LTC6263 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, and rail-to-rail inputs and outputs. They are unity gain stable with capacitive loads up to 1nF. They feature 30MHz gain-bandwidth product, 7V/μs slew rate while consuming only 240μA of supply current ...

Circuit LTspice 

 

LTC6261 Third Order Butterworth Filter

Jan 17th 2017
The LTC®6261/LTC6262/LTC6263 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, and rail-to-rail inputs and outputs. They are unity gain stable with capacitive loads up to 1nF. They feature 30MHz gain-bandwidth product, 7V/μs slew rate while consuming only 240μA of supply current ...

Circuit LTspice 

 

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 

 

Single-Ended to Differential Driver Circuit for the LTC2387-18 SAR ADC

Doug Stuetzle - Senior Analog Applications Engineer Sep 26th 2016
The LTC®2387-18 is a 15Msps, highly linear, low-noise SAR converter with differential inputs. The combination of excellent linearity and wide dynamic range makes this ADC ideal for high speed imaging and instrumentation applications. No-latency operation provides a unique solution for high speed control loop applications. ...

Blog Post Circuit LTspice 

 

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 

 

Baseband Design Example for LTC5589/LTC5599 Low-Power IQ Modulator

Bruce Hemp - Applications Section Leader Jul 1st 2016
Introduction This basic low power modulator was described in the LT Journal Nov 2015 article. In this blog post, we will show how to: Use simulation to validate the filter design, and Reduce DC offsets by utilizing Differential Amplifiers for the baseband drive. Also shown are some miscellaneous tips to help complete ...

Blog Post Circuit LTspice 

 

High Accuracy, μPower, Over-Voltage Detector with Glitch Suppressor Using LTC1541 and LTC6994

May 4th 2016
An overvoltage detector which suppresses glitches is constructed from the LTC®1541 micropower op amp + comparator + voltage reference and LTC6994-1 TimerBlox® delay block/debouncer. In this circuit, the LTC1541 comparator detects power rail overvoltage conditions (including glitches). The built-in op amp inverts this ...

Circuit LTspice 

 

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 

 

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 

 

LTC6363 LTC6363 Used as Lowpass Filter/Driver with 10VP-P Singled-Ended Input, Driving a SAR ADC

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC6363 Differential AV = 1/9 Configuration Using an LT®5400 Quad-Matched Resistor Network

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC6363 Single-Ended-to-Differential Conversion of a 20VP-P Ground-Referenced Input with Gain of AV = 0.5 to Drive an ADC

Aug 31st 2015
The LTC®6363 is a low power, low noise, fully differential op amp with rail-to-rail outputs optimized to drive low power SAR ADCs. The LTC6363 draws only 1.9mA supply current in active operation and features a shutdown mode which reduces the current consumption to 20μA (VS = 3V). ...

Circuit 

 

LTC3121 Single Li-Cell 3-LED Driver, 2.5V/4.2V to 175mA

Aug 27th 2015
The LTC®3121 is a synchronous step-up DC/DC converter with true output disconnect and inrush current limiting. The 1.5A current limit along with the ability to program output voltages up to 15V makes the LTC3121 well suited for a variety of demanding applications. Once started, operation will continue with inputs down to ...

Circuit 

 

LT6023 Gain of 11 Instrumentation Amplifier

Jun 17th 2015
The LT®6023 is a low power, enhanced slew rate, precision operational amplifier. The proprietary circuit topology of this amplifier gives excellent slew rate at low quiescent power dissipation without compromising precision or settling time. In addition, proprietary input stage circuitry allows the input impedance to remain ...

Circuit 

 

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 

 

LT6237 Single Supply, Low Noise, Low Power, Bandpass Filter with Gain =10

Sep 25th 2014
The LT®6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/√Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/μs slew ...

Circuit 

 

LT6237 Low Power Avalanche Photodiode Transimpedance Amplifier IS = 3.3mA

Sep 25th 2014
The LT®6236/LT6237/LT6238 are single/dual/quad low noise, rail-to-rail output op amps that feature 1.1nV/√Hz input referred noise voltage density and draw only 3.5mA of supply current per amplifier. These amplifiers combine very low noise and supply current with a 215MHz gain bandwidth product and a 70V/μs slew ...

Circuit 

 

LTC6102 Simple 500V Current Monitor

Aug 4th 2014
The LTC®6102/LTC6102HV are versatile, high voltage, highside current sense amplifiers. Their high supply voltage rating allows their use in many high side applications, while the low drift and offset ensure accuracy across a wide range of operating conditions. The LTC6102-1 is a version of the LTC6102 that includes a low ...

Circuit LTspice 

 

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 

 

LT6015 Gain of 100 High Voltage Difference Amplifier with –5V/75V Common Mode Range

Jun 20th 2013
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...

Circuit 

 

LT6016 Wide Input Range Current Sense Amp Goes Hi-Z When VSUPPLY Removed

Nov 5th 2012
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...

Circuit 

 

LT6016: Precision High Voltage High Side Load Current Monitor

Nov 5th 2012
The LT6016/LT6017 are dual and quad rail-to-rail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. The Over-The-Top input stage of the LT6016/LT6017 is designed to provide ...

Circuit LTspice 

 

LT6016 Extended Supply Current Boosted Gain of Three Amplifier Drives 100Ω Load to ±30V, with 600mA Current Limit

Nov 5th 2012
The LT®6015/LT6016/LT6017 are single/dual/quad rail-torail input operational amplifiers with input offset voltage trimmed to less than 50μV. These amplifiers operate on single and split supplies with a total voltage of 3V to 50V and draw only 315μA per amplifier. They are reverse battery protected, drawing very little ...

Circuit 

 

Wide Common Mode Range 10x Gain Instrumentation 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 

 

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 

 

1.8V, 140uA, 100kHz, Lowpass Filter (Single-Ended Input and Differential Output)

Jun 10th 2010
The LTC6256 circuit shown here is a 2nd order, 100kHz, Butterworth lowpass filter. The filter’s differential output maximizes the dynamic range in very low voltage operation. The LTC6255/LTC6256/LTC6257 are single/dual/quad operational amplifiers with low noise, low power, low supply voltage, rail-to-rail input/output. ...

Circuit 

 

ADC Driver With Single-Ended Input to Differential Output

Dec 14th 2009
The LT6350 is a rail-to-rail input and output low noise single-ended to differential converter/ADC driver featuring fast settling time. It converts a high or low impedance, single-ended input signal to a low impedance, balanced, differential output suitable for driving high performance differential succesive approximation register ...

Circuit 

 

LT2940 Adjustable 0W to 10W Load Box with UVLO and Thermal Shutdown

Nov 30th 2009
The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate ...

Circuit 

 

LT2940 1-Cell Monitor with Bottom-Side Sense

Nov 30th 2009
The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate ...

Circuit 

 

Single 2.7V Supply 4MHz 4th Order Lowpass Butterworth Filter

Oct 2nd 2009
Benefiting from low voltage operation and rail-to-rail output, a low power filter that is suitable for antialiasing can be built as shown in this circuit. On a 2.7V supply the filter has a passband of approximately 4MHz with 2VP-P input signal and a stopband attenuation that is greater than –75dB at 43MHz. The resistor and ...

Circuit 

 

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 

 

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 

 

Single Ended To Differential Transimpedance Amplifier

Aug 3rd 2007
This circuit shows the LTC6406 connected as a single-ended transimpedance amplifier with 20kΩ of transimpedance gain. The BF862 JFET buffers the LTC6406 input, drastically reducing the effects of its bipolar input transistor current noise. The VGS of the JFET is now included as an offset, but this is typically 0.6V so ...

Circuit 

 

LTC6406: 133MHz Differential Amplifier with External Gain Set, Impedance Matching to a 75Ω Source and Level Shifting

Aug 3rd 2007
This circuit shows an example of a single-ended-to-differential amplifi er matching a 75Ω source and level shifting from a 2.5V input common mode to a 1.25V output common mode voltage (typical level shifting required from a 5V single-ended circuit to a 3V differential circuit to drive a high speed ADC). The singleended- ...

Circuit LTspice 

 

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 

 

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 

 

400MHz, 5V Single Supply Video Driver (AC Coupled)

Sep 22nd 2006
The LT6557 400MHz triple video driver is specifically designed to operate in 5V single supply AC-coupled applications as shown. The input biasing circuitry is contained on-chip for minimal external component count. A single resistor programs the biasing level of all three channels. ...

Circuit 

 

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 

 

Micro Power Oxygen Sensor

Sep 21st 2006
Micro Power Oxygen Sensor takes advantage of low and clean startup current characteristics and wide supply voltage range, 1.8V to 16V range. ...

Circuit 

 

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 

 

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 

 

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 

 

Single-Ended to Differential Converter with Gain of +2 and Common Mode Control

Aug 15th 2006
Because the gains of each channel of the LT6411 can be configured independently, the LT6411 can be used to provide a gain of +2 when amplifying differential signals and when converting single-ended signals to differential. With both channels connected to a single-ended input, one channel configured with a gain of +1 and the ...

Circuit 

 

A 133MHz Differential Amplifier with External Gain Set, Impedance Matching to a 75Ω Source and Level Shifting

Dec 8th 2005
Complete single ended 75Ω input impedance to differential out, level shifting 2.5V input to 1.25V differential common mode, single ended to differential gain of 2 using external resistors circuit example. ...

Circuit LTspice 

 

High Accuracy Oxygen Sensor

Nov 17th 2005
High Accuracy Oxygen Sensor. Accuracy is achieved using a transimpedance approach. Reduction in noise gain gives a reduction in output offset error from 50mv to 500µa. ...

Circuit 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 

 

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 ...

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