Hi guys,
I'm in the process of designing a current sensing amplifier/anti-aliasing filter for some digital power control. I found an interesting circuit that's in use for sensing the switch current in a PFC boost converter but I don't understand a certain aspect of it. What is the purpose of the two 220pF capacitors on the differential input? I can't seem to wrap my head around the reason for their placement.
The active filter in question is:
The frequency response of this low-pass filter is:
Thanks
I'm in the process of designing a current sensing amplifier/anti-aliasing filter for some digital power control. I found an interesting circuit that's in use for sensing the switch current in a PFC boost converter but I don't understand a certain aspect of it. What is the purpose of the two 220pF capacitors on the differential input? I can't seem to wrap my head around the reason for their placement.
The active filter in question is:
The frequency response of this low-pass filter is:
Thanks
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