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Operational Amplifiers

SPICE projects of Operational Amplifiers as Inverting Amplifier and Not Iverting Amplifier configuration, Comparators, Window Comparators, Schmitt Trigger, Bandwidth Limiters, Voltage Followers, etc

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  • Buffering a Precision Operational Amplifier

    Created by TINADesigner, published on 11-04-2013

    Driving a load impedance with a precision operational amplifier reduces its features, as the offset voltage, bias current, drift etc. In this simulation a buffer amplifier is placed between the precision amplifier and its load. In this way the precision amplifier maintains its features and the buffer has the task of driving the load. Click here to analyze this circuit on-line with TINACloud.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+, TINACloud No 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • Zoom Amplifier

    Created by TINADesigner, published on 13-02-2013

    this circuit uses a precision low power instrumentation amplifier INA128 to amplify a small AC signal superimposed on a much larger DC voltage. When the switch is closed both inputs see the same AC+DC level and the high common mode rejection gives a zero output voltage. When the switch is open the AC signal is applied to only the inverting input, while to the not inverting input is applied the DC level stored on a high insulation resistance dielectric capacitor.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+ No <10

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • Bootstrapped Input For High Impedance

    Created by TINADesigner, published on 03-01-2013

    Bootstrapping involves the use of a small amount of positive feedback from output to input of an amplifier, of nearly unity gain. The bootstrap technique is used to make a low value input resistor, R3 in this case, appear to have a much higher value as seen by the input signal. Without feedback the input resistance is R3 (1M) in parallel with the input resistance of U1 (1E13 ohms).Positive feedback applied through the voltage divider R1- R2 multiplies the effective input impedance of R3.Adding bootstrapping also increases the noise gain of the op amp, multiplying its Vos, drift, and noise. Adding a LARGE capacitor in series with R1 can eliminate the amplified DC offset and drift but the low frequency noise will still suffer.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+ No 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • Operational Amplifier as Differential Amplifier

    Created by NiMultisimDesigner, published on 19-12-2012

    the operational amplifier AD822AN with dual power supply +-12V works as differential amplifier. The ratio R2/R1 must be equal to R4/R3.A mismatch determines the common mode rejection capability of the circuit. The gain of amplifier is R2/R1.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple NI Multisim 11+ No <10

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • 330 Khz 80 Db Gain Low Noise Amplifier

    Created by TINADesigner, published on 06-11-2012

    two OPA2228 gain stages in cascade implements this amplifier with bandwidth of 300khz and gain of 80 db. The single operational amplifier opa2228 is a dual op amp with low input voltage noise, 3nV/rtHz at 1khz, bandwidth 33Mhz and slew rate 11V/us.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+ Yes 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • LTspice Modeling of Universal Operational Amplifier

    Created by LTspiceDesigner, published on 11-09-2012

    LTspice model with 4 levels of accuracy of the description of an operational amplifier.The first level models a linear single pole opamp with no slew rate or output voltage range limit. The second level introduces the slew rate and output voltage and current limit. The third level is a two pole with programable phase margin and the fourth level shows a dominant pole.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple LTspice IV No <10

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • OPA1632 High Performance Audio Operational Amplifier

    Created by TINADesigner, published on 29-08-2012

    The OPA1632 is a fully-differential amplifier designed for driving high-performance audio analog-to-digital converters (ADCs).It provides high sound quality with an ultra low distortion and very low output noise. The high speed device has a slew rate of 50V/us and a gain bandwidth of 180 Mhz.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+ No 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • SPiCE model of P2 Operational Amplifier

    Created by LTspiceDesigner, published on 26-08-2012

    SPICE simulation of the first Solid State Operational Amplifier designed in 1960 by Robert Malter of George A. Philbrick Researches. A basic circuit of 7 transistors and two little transformers with the input bias current at either input of just a few picoamperes.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Intermediate LTspice IV No 51-100

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • Load Cancellation Circuit

    Created by TINADesigner, published on 09-12-2011

    The next stage of a voltage follower op amp, is a second op amplifier that implements a load cancellation circuit. The output current of first op amp is a function of its input voltage Vin and its load resistance RL.For example when Vin = 1V, AM1 (U1 output) and AMload (load current) = -1mA. The cancellation circuit provides all or part of this current. With compensation adjusted for 100%, the load current is furnished entirely by the compensation circuit. Thus the output of U1 essentially sees an "open circuit". Rc controls the degree of load current compensation.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple Tina 7+ No 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

  • Window Comparator

    Created by EDWin2011, published on 31-10-2011

    Two operational amplifier with double power supply +/-15V implements a window comparator. Once fixed two voltages, for example with two potentiometers, the output is low when the input voltage ranges between these voltages, and the output go high when the input voltage is out of this range.

    FREE

    (only to registered users)

    Project Type: Free

    Complexity Spice Software Software Version Full version Components number
    Simple EDWinXP 1.61+ No 11-20

    Path: SPICE Projects > General Electronics > Operational Amplifiers

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