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In Reply to: Yes. posted by Ralph on November 21, 2024 at 13:03:02:
IIUC, you are contrasting non-inverting feedback with inverting feedback. You can do either with an op amp or with a Lin-style audio power amp. I get the point you are making that for the inverting feedback case the input differential amplifier appears 'within' the feedback loop but appears 'outside' the feedback loop for the inverting feedback case. I say appears because there may be no significant difference as the feedback will drive the input differential signal to be the same for both cases with the same closed-loop gain.
Diff pairs, whether FET of BJT are the most linear amplifier configurations for small signals. If you apply a lot of feedback the input differential input should be tiny. Degenerating the diff pair is usually done to cope with transient overload of the error signal - the appendix in Putzeys' 'F-Word' article explains this really well.
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Follow Ups
- RE: Yes. - 13th Duke of Wymbourne 10:20:01 11/22/24 (4)
- Yes. - Ralph 10:40:28 11/22/24 (3)
- RE: Yes. - 13th Duke of Wymbourne 17:32:35 11/23/24 (2)
- You can't compare using an opamp - Ralph 09:41:13 11/25/24 (1)
- That's why I suggested we end with the last post - 13th Duke of Wymbourne 14:25:32 11/26/24 (0)
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