Integrator circuit



The integrator circuit outputs the integral of the input signal over a frequency range based on the circuit time constant and the bandwidth of the amplifier. The input signal is applied to the inverting input so the output is inverted relative to the polarity of the input signal. The ideal integrator circuit will saturate to the supply rails depending on the polarity of the input offset voltage and requires the addition of a feedback resistor, R2, to provide a stable DC operating point. The feedback resistor limits the lower frequency range over which the integration function is performed.

This circuit is most commonly used as part of a larger feedback/servo loop that provides the DC feedback path, thus removing the requirement for a feedback resistor.

  • Input
    • f_min = 100 Hz
    • f_0dB = 1 kHz
    • f_max = 100 kHz
  • Output = ±2.45 V
  • Supply = ±2.5 V
General-purpose op amps
TLV9002 Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications
Precision op amps (Vos<1mV)
OPA376 Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp
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Technical documentation

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Type Title Date
* Circuit design Integrator circuit (Rev. A) PDF | HTML 31 Jan 2019
Application note AN-31 Amplifier Circuit Collection (Rev. D) 21 Oct 2020
More literature Linear Integrated Circuits and its Applications 15 Feb 2017
Application note Handbook of Operational Amplifier Applications (Rev. B) 19 Sep 2016

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