Question

In the holding circuit built using op-amp the diode is used to
i) avoid discharging of the capacitor
ii) charge the capacitor
iii) provide grounding of op-amp input
iv) convert charge into voltage

Answer 1

Answer:

charge the capacitor, I think so

Answer 2

Answer:

The correct option is 2) charge the capacitor.

Concept:

The analogue circuit component known as an operational amplifier (op amp) converts a differential voltage input into a single-ended voltage output. Op amps typically feature three terminals: a low-impedance output port and two high-impedance inputs. The non-inverting input is designated with a positive (+) sign, whereas the inverting input is indicated with a minus (-) sign. Operational amplifiers act to increase the voltage difference between the inputs, which is beneficial for many analogue tasks such as power, control, and signal chain applications.

Given:

A holding circuit using op-amp.

Find:

For what purpose op-amp holding circuit is used.

Solution:

Regarding resistor value, there are various restrictions that you must observe:

The op-amp regulates how much current you can sink at once.

The forward voltage of the diode limits the lowest voltage you can discharge the capacitor to.

The current limiting resistor's continuous power rating must not be exceeded.

So, the charging the capacitor is the correct option.

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