GATE EE 2014 Set 1 — Question 32
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Analog & Digital Electronics → Amplifiers & Feedback → RC & LC Oscillators
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Question
In the Wien Bridge oscillator circuit shown in figure, the bridge is balanced when
Correct answer
(C) (R₃)/(R₄) = (R₁)/(R₂) + (C₂)/(C₁), ω = 1√(R₁ C₁ R₂ C₂)
Solution
For a Wien Bridge oscillator, the balance condition is obtained by equating the ratio of the arms. Let and . The bridge is balanced when .Equating the imaginary part to zero for oscillation frequency:
Equating the real part:
Equating the real part:
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