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Solutions Search - Amplifier Gain Blocks

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 

 

Tuned IF Amplifier Applications

John Chung - Applications Engineer Oct 21st 2016
Introduction The LTC6431-20 and LTC6433-15 are single-ended RF / IF gain block amplifiers that feature very high OIP3 with low noise and a gain of 20dB and 15dB respectively. The unique combination of high linearity, low noise and low power dissipation make this an ideal candidate for many signal-chain applications. These fixed ...

Blog Post 

 

LT6375 27dB Audio Gain Stage

Aug 31st 2015
The LT®6375 is a unity-gain difference amplifier which combines excellent DC precision, a very high input common mode range and a wide supply voltage range. It includes a precision op amp and a highly-matched thin film resistor network. It features excellent CMRR, extremely low gain error and extremely low gain drift. ...

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 

 

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 

 

Paralleling Amplifiers and Layout Essentials for Driving Capacitive Loads Fast - LT1397, LT1206, LT1207

Glen Brisebois - Applications Engineer - Signal Conditioning Dec 15th 2008
Certain video and other technologies require driving planar conductive surfaces fast. Unfortunately, the surfaces can have high capacitance, which means that driving them fast takes high currents. This complicates the amplifier design but the situation extends beyond just the amplifier. Between the amplifier and the capacitive ...

Video 

 

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 

 

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 

 

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 

 

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 

 

Wideband Digitally Programmable Gain Amplifier

Jun 27th 2005
The LTC6910 is a CMOS programmable gain (from 0 to 64) amplifier. The amplifiers provide for a differential input signal and for dc biasing the output into a precise voltage reference based level in a single supply design. ...

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 

 

Extending Input Common Mode Range For LT1992

Feb 3rd 2003
Tying the Vocm pin to the Vmid Pin and using two equal voltage dividers with external feedback resistors is used in this circuit to extend the input Common Mode Range of LTC1992. ...

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 

 

Audio Amplitude Compressor

Jan 19th 2001
A True RMS converter (LTC1967) monitors the output signal amplitude and provides a proportional dc feedback voltage. This dc voltage controls an LT1256 fader circuit which linearly selects the amount of signal from two amplifier stages. One amplifier attenuates the input signal by 4 while the other amplifier gains up the signal ...

Circuit 

 

Low Noise AC Amplifier with Programmable Gain and Bandwidth

Jan 20th 2000
Two LTC6910 programmable gain amplifiers can be combined to provide independent gain and bandwidth control using two 3 bit digital words. The Gain Control PGA simply varies the circuit gain from 1 to 100. The Bandwidth Control PGA puts signal gain inside the feedback loop of the amplifier. As this gain is increased the effective ...

Circuit 

 

Autoranging True RMS-to-DC Converter

Sep 10th 1999
A programmable gain amplifier (LTC6910-2) and a window comparator (LTC6700-1) and some control logic creates a wide dynamic range RMS to DC converter. The comparator monitors the DC output and signals whether to increment or decrement the gain to maintain a predetermined output voltage range. Knowing the output DC voltage and ...

Circuit 

 

Using All four Amplifiers of the LT1397 to Drive Large zCapacitive Loads

Jan 10th 1999
Four paralleled amplifiers increase load capacitor current drive capability. A small ballast resistor at each output increases isolates the effects of each amplifier's different output offset. ...

Circuit 

 

Precision Amplifier Drives 500ohm Load to ±10V

Jan 1st 1998
Two amplifiers can be combined to double the output current of just one amplifier. In this circuit the gain is arranged in such a way that ensures that each amplifier contributes half of the load current. One tenth of the output voltage is impressed across a resistor that is one fifth of the load resistor making its current ...

Circuit 

 

Precision ±10V Reference

Jan 1st 1998
A precision 6.9V reference can be scaled up to +10V and then inverted with a precision -1 gain stage to provide symmetrical +/-10V reference voltages. The 3.3K resistor feeding back to the + input of the non inverting amplifier maintains a constant 1mA of current to bias the zener reference device. ...

Circuit 

 

DC Accurate Composite Amplifier

Apr 1st 1992
Most individual op amp devices are optimized for either DC precision or for high speed operation. A composite amplifier configuration uses a precision low offset and drift amplifier to control the dc biasing of a high speed amplifier. This circuit has a gain bandwidth product of 1.25MHz yet an input offset voltage of only 25uV ...

Circuit 

 

Self Buffered Micropower Reference

Jan 1st 1987
The opamp provides controlled bias current to a shunt reference through its supply connection. Since the opamp can operate with both inputs and outputs at the low-side supply potential, the buffer action works properly for sourcing output current at the same voltage as the reference itself. ...

Circuit 

 

Half-Wave Rectifier

Jan 1st 1987
This is a conventional inverting amplifier, but with a single supply the output can only provide the positive side of the result. The specific characteristics of the opamp provide well controlled clipping behavior. ...

Circuit 

 

LT1055 ±120V Output Precision Op Amp

Jan 1st 1987
Simple shunt regulators provide normal supply levels to the op amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails. Output transistors are protected by current-limiting. ...

Circuit LTspice 

 

Wideband, High Input Impedance, Gain = 1000 Amplifi er

Jan 1st 1987
The gain is distributed equally between four amplifier sections in cascade, so the gain of each section is about 5.6. Distributing the gain uniformly provides the best bandwidth. Trimming of the final stage corrects for resistor variances so that overall gain is 1000x. ...

Circuit 

 

Micropower, 10ppm/°C, ±5V Reference

Jan 1st 1987
The left opamp precisely amplifies the 1.2V shunt reference to +5V and the right section inverts that to make -5V. ...

Circuit 

 

Programmable Gain Amplifier (Single Supply)

Jan 1st 1987
The CMOS switch selects which feedback node is used, thus setting the loop gain to different levels as desired. The advantage of this circuit is that the capacitance and leakage effects are isolated from the feedback resistors so accuracy is maintained. The deselected opamp sections saturate, but remain well behaved with the ...

Circuit 

 

Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz

Jan 1st 1987
With a typical open loop gain value of 20 million V/V, very high closed loop gain amplifiers can be implemented with remarkable accuracy. Even with such a high gain, the trimmed precision produces a dc output offset of only 20mV. ...

Circuit 

 

Low Noise, Wideband, Gain = 100 Amplifi er with High Input Impedance

Jan 1st 1987
Averaging of three identical input stages reduces random noise addition by √3. Each input stage has a gain of about 10.2, and the second stage adder is trimmed for an accurate overall 100x. ...

Circuit 

 

Dual Buffered ±0.617V Reference Powered by Two AA Batteries

Nov 1st 1983
Lower opamp is a precision inverter setting outputs to set the outputs at the same magnitude but opposite polarity. The upper opamp drives the positive output so that the difference of the two outputs is the reference voltage, so the result is that half the reference voltage is the magnitude of the outputs. ...

Circuit