Interview Question

Interview Milpitas, CA

For an op-amp with 1kOhm output impedance and 1MHz GBP (1st

  order gain rolloff), operated as a follower and driving a capacitive load, what value of capacitance will bring the phase margin to 45 degrees?

Interview Answer

1 Answer


Its source follower opamp so gain is one .. First pole is at 1 MHz approximately .. Op is capacitive load so we can find capacitance value.. It's one pole system .. We can get equation for phase margin equating it to 45 degrees and calculate capacitance value.

Anonymous on Jun 1, 2014

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