Discussion
The phase shift introduced by feed network or amplifier in Wein bridge oscillator is
Answer: A
The phase shift introduced by the feedback network of a Wien bridge oscillator is zero degrees, option (A). At the frequency of oscillation, \(f = 1/(2\pi RC)\), the series-parallel RC network gives a phase shift of 0 degrees and an attenuation of one third. The non-inverting amplifier that goes with it also gives 0 degrees, so the total phase around the loop is 0 and the Barkhausen condition is met when the amplifier gain is 3. A shift of 180 degrees, option (C), is typical of the RC phase-shift oscillator, and 90 and 270 degrees, options (B) and (D), are not needed in the Wien bridge.
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