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What is quiescent point or Q-point?

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What is quiescent point or Q-point?

(a) Operating point of device

(b) The point at which device have maximum functionality

(c) The point at which current equal to voltage

(d) The point of V-I graph where slope is 0.5

This question was addressed to me in final exam.

The above asked question is from Resistance Level in chapter Diode Circuit of Analog Circuits

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Correct answer is (a) Operating point of device

The explanation: Quiescent point of a device represents operating point of a device. For a diode quiescent point is determined by constant DC current through the diode. The Q-point is the DC voltage or current at a specified terminal of an active device with no input applied. A bias circuit is used to supply this steady voltage/current.

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