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My DAC chip is included delta-sigma modulator and class D amplifier.
The active filter is connected off chip, so I use an ideal differential op in Spectre to model a filter off chip.
I think an active filter behind a class D amplifier can reduce the size of my class...
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...
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