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
Get started
- Read the circuit design
- Download the model
Technical documentation
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| Type | Title | Date | ||
|---|---|---|---|---|
| Circuit design | AC coupled instrumentation amplifier circuit (Rev. A) | PDF | HTML | Oct 9, 2024 | |
| Application note | AC Coupling Instrumentation and Difference Amplifiers | Sep 27, 2000 |