CIRCUIT060027

Integrator circuit

CIRCUIT060027

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Overview

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 which provides the DC feedback path, thus removing the requirement for a feedback resistor.
Features
  • Input:
    • f_min = 100 Hz
    • f_0dB = 1 kHz
    • f_max = 100 kHz
  • Output = ± 2.45 V
  • Supply = ± 2.5 V

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Design tool

Simulation for Integrator Circuit SBOC496.ZIP (465KB)

Supported products & hardware

Supported products & hardware

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

Technical documentation

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

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Reference designs

REFERENCE DESIGN
TIPD191 Instrumentation Amplifier with DC Rejection Reference Design

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