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The twin-T oscillator produces a ________ response.

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The twin-T oscillator produces a ________ response.

(a) low-pass

(b) high-pass

(c) band -pass

(d) band-stop

I have been asked this question in exam.

Question is taken from Oscillators topic in section Power Amplifiers of Electronic Devices & Circuits

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Correct choice is (d) band-stop

Best explanation: Twin T-oscillator is an RC oscillator consists of Twin T-network and an op-amp. Twin-T is actually a combination of low pass and high pass filter combined parallel response provides a band-stop filter with a center frequency equal to

fr=1/2πRC

This is resonant frequency, Oscillations can occur only at this frequency as the filter provides significant negative feedback at frequencies below or above the resonant frequency which is not good for oscillation.

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