C
[email protected]
- Jan 1, 1970
- 0
I need to design an amplifier that takes in a differential signal (call
these inputs A and B), adds a bias C (where this signal is referenced
to amplifier's ground), and applies a high gain (G ~= 100). In other
words:
Output = ((A-B) + C) * G
I need this operation performed for two channels, and I want to
minimize the number of ICs and components required. High CMRR is a
plus. In an earlier generation of this design, I was performing this
operation using an instrumentation amplifier (where bias signal C was
added after the gain, i.e.):
Output = (A-B)*G + C
But I've realized that I definitely need to be biasing before the gain.
Any creative ideas?
Best,
Chess
these inputs A and B), adds a bias C (where this signal is referenced
to amplifier's ground), and applies a high gain (G ~= 100). In other
words:
Output = ((A-B) + C) * G
I need this operation performed for two channels, and I want to
minimize the number of ICs and components required. High CMRR is a
plus. In an earlier generation of this design, I was performing this
operation using an instrumentation amplifier (where bias signal C was
added after the gain, i.e.):
Output = (A-B)*G + C
But I've realized that I definitely need to be biasing before the gain.
Any creative ideas?
Best,
Chess