Venkadesh_M
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the current source circuit is nothing to do with the frequency (OPamp can be choosen with low response time) but the chopper needs to be done the PWM, Normal power mosfets works upto 2MHZ with 50% duty cycle so some more faster mosfets could easily do PWM upto 1MHZ..
https://in.mouser.com/Semiconductor...Z1z0w7kyZ1z0w9ss&Keyword=fast+mosfets&FS=True
https://in.mouser.com/Semiconductor...Z1z0w7kyZ1z0w9ss&Keyword=fast+mosfets&FS=True
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