In the circuit of an Op-Amp as an integrator, the feedback circuit mainly contains a ______.

Question

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1

Answer 1

An ideal Integrator circuit is shown below:

F1 R.D M.P 14.08.19 D1 (1)

It is clear from the circuit diagram of the integrator, the feedback element is a Capacitor.

Note:

At high frequencies, the capacitor is a short circuit so the output is 0.

At low frequencies, the capacitor is an open circuit, the output voltage is the amplified input voltage(the output is non-zero).

thus an ideal integrator acts as a low pass filter.

26 June 1

The feedback path in an op-amp differentiator consists of a resistor.

differentiator

At high frequencies, the capacitor is a short circuit so the output is the amplified input voltage(the output is non-zero)

At low frequencies, the capacitor is an open circuit, the output voltage is 0.

thus an ideal Differentiator acts as a High pass filter.