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Tool/software:
Hello,
I'm looking to take a sample of a power supply output voltage that ends up being noisy. It is noisy because of power supply switching noises that produce 2nd-order ringing even on the output of our isolated amplifier that are in excess of 200mV peak to peak. This is with just gate drivers going and no power connected.
The ringing settles out between gate drive pulses, but the gate drive is of a variable frequency, as the converter I'm working on is a resonant converter. If I run the ADC at a fixed frequency, it seems I would run into the issue of potentially taking bad data by sampling on the switching transition quite often.
An idea I had was dynamically writing a new ADC sampling time after each interrupt and after each new frequency (in the form of a TBP register update) is issued. I understand this could create significant problems for a control loop, as typically systems are analyzed with a fixed sample time in mind.
What ideas have you seen deployed to deal with switching ringing on an ADC? Do i simply average it over some cycles with a digital filter? Could I "move" the ADC sample rate and time such that it samples in the "middle" of the gate drive pulse, avoiding the noisy switching ends?
Thanks,
Reid
