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Analog Electronics - Engineering

Q1:

In oscillator circuits the energy feedback to its input terminal from output is

A always in phase with the input signal

B 90° out of phase with the input signal

C 180° out of phase with the input signal

D 270° out of phase with the input signal

ANS:C - 180° out of phase with the input signal

It should be in phase for 180-degree phase change, oscillations won't even start. In fact, it will be negative feedback. This is true only for the non-inverting amplifier. For inverting amplifier, the phase change is important else this will be counted as negative feedback.