CIRCUIT060067

Alternating current (AC) coupled instrumentation amplifier circuit

CIRCUIT060067

Overview

This circuit produces an AC-coupled output from a DC-coupled input to an instrumentation amplifier. The output is fed back through an integrator, and the output of the integrator is used to modulate the reference voltage of the amplifier. This creates a high-pass filter and effectively cancels the output offset. This circuit avoids the need for large capacitors and resistors on the input, which can significantly degrade CMRR due to component mismatch.
Features
  • Input: Vi = -13 V to 13 V
  • Output: Vo = -14.85 V to 14.85 V
  • Supply:
    • Vcc = 15 V
    • Vee = -15 V
  • Lower cutoff frequency = 16 Hz
  • Gain = 1
  • Input = ±2 VAC; +10 VDC
Instrumentation amplifiers
INA828 50-μV Offset, 7-nV/√Hz Noise, Low-Power, Precision Instrumentation Amplifier
General-purpose op amps
TLV171 Single, 36-V, 3-MHz, low-power operational amplifier for cost-sensitive applications
Precision op amps (Vos<1mV)
OPA188 Precision, Low-Noise, Rail-to-Rail Output, 36V Zero-Drift Operational Amplifier

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Technical documentation

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Type Title Date
* Circuit design AC coupled instrumentation amplifier circuit Jan. 09, 2019
Application note AC Coupling Instrumentation and Difference Amplifiers Sep. 27, 2000

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