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I want to filter output of my full-bridge class d power amp. I'm trying to connect an ideal differential op to class d output for simulation. But class d output through ideal differential op , growing noise floor(5~10dB). I suspect that problem is incorrect op/filter connection. (pic. A) pic.A

First, I'm mapping circuit(pic. A) to spectre(use one VCVS(pic. B) or two VCVS(pic. C)). I'm trying 2 connections below:

pic. B one VCVS class d output SNDR is 96dB, op(ideal, gain: 100000) out is 82 dB problem is that op is ideal, 96dB to 82dB doesn't make sense.

pic. C two VCVS class d output SNDR is 96dB, op(ideal, gain: 100000) out is 74 dB problem is that op is ideal, 96dB to 74dB doesn't make sense.

I think SNDR of ideal differential op output, sholdn't decrease much.

Does the connection of op(pic.B or pic.C) is correct? Any suggestion?

林致廷
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  • StackOverflow if for programming questions. You might have more luck trying https://electronics.stackexchange.com/ – Mouse On Mars Mar 18 '19 at 13:25
  • Would you mind deleting the question here if you ask it there, especially since cross posting has to be avoided? – Paradox Mar 20 '19 at 17:56

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