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For any Wien Bridge oscillator, R1 = R2 and C1 = C2 always in the bridge, provided the phase shift through the amplifier is zero.

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For any Wien Bridge oscillator, R1 = R2 and C1 = C2 always in the bridge, provided the phase shift through the amplifier is zero.

(a) True

(b) False

This question was posed to me in a job interview.

Enquiry is from Weinbridge Oscillator in chapter Oscillators of Analog Circuits

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Right option is (b) False

Easy explanation: The bridge circuit is used as feedback for the oscillator, provided that phase shift through the amplifier is zero. At this point the bridge has to be balanced, however not necessarily that R1 = R2 and C1 = C2. This condition is just a case of the bridge being balanced.

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