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At high frequencies an op-amp differentiator circuit becomes unstable and will

start to oscillate. This is due mainly to the first-order effect, which determines

the frequency response of the op-amp circuit causing a second-order response

which, at high frequencies, gives an output voltage far higher than what would

be expected. To avoid this, the high frequency gain of the circuit needs to be

reduced by adding an additional small value capacitor across the feedback resistor Rf .

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