Physics · Amplifiers

The Nyquist criterion for stability states that an amplifier is unstable if the Nyquist curve encloses the -1 + j0 point, and the amplifier is stable if the curve does not enclose this point. If the loop gain Aβ:

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1extends inside this circle, the feedback is negative
2does not enclose the point -1 + j0, i.e., |1 + Aβ| > 1, then the amplifier is unstable, and the feedback is negative for all frequencies
3lies within this circle, then |1 + Aβ| < 1, and the feedback is positive✓
4extends outside this circle, the feedback is negative

Correct answer

lies within this circle, then |1 + Aβ| < 1, and the feedback is positive

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