Circuit P has desensitivity 20, circuit Q has sensitivity 0.1 and circuit R has desensitivity 40. Which of the following is more stable in gain?(a) Circuit P(b) Circuit Q(c) Circuit R(d) All circuits are equally stable in gainI had been asked this question in exam.The above asked question is from Effects of Feedback in section General and Feedback Amplifiers of Analog Circuits

Circuit P has desensitivity 20, circuit Q has sensitivity 0.1 and circ

1.	Circuit P has desensitivity 20, circuit Q has sensitivity 0.1 and circuit R has desensitivity 40. Which of the following is more stable in gain?(a) Circuit P(b) Circuit Q(c) Circuit R(d) All circuits are equally stable in gainI had been asked this question in exam.The above asked question is from Effects of Feedback in section General and Feedback Amplifiers of Analog Circuits
Answer» Correct option is (c) Circuit R To explain: Greater desensitivity INDICATES better stability in gain. More desensitivity means gain becomes SMALLER, but stable. For circuit Q, desensitivity = 1/S = 10 Circuit R has higher desensitivity, hence most stable.

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