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:
- Lower cutoff frequency = 16 Hz
- Gain = 1
- Input = ±2 VAC; +10 VDC