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RC phase shift oscillators contain a minimum of _________ Phase shift network.

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RC phase shift oscillators contain a minimum of _________ Phase shift network.

(a) 1

(b) 2

(c) 3

(d) 0

This question was posed to me in final exam.

This intriguing question originated from RC Phaseshift Oscillator topic in division Oscillators of Analog Circuits

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Correct answer is (c) 3

The explanation: RC phase shift oscillator contains a minimum of three phase shift networks. There can be also four and it increases the stability of oscillation. They yield a pure sine wave for a variety of loads.

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