Question

The output of a stable oscillator have ___________

(a) Constant amplitude

(b) Varying amplitude

(c) Constant amplitude at high frequencies only

(d) Constant amplitude at low frequencies only

The question was posed to me in an international level competition.

The doubt is from Introduction to Oscillator topic in division Oscillators of Analog Circuits

Answer 1

The correct answer is (a) Constant amplitude

The explanation is: Output of a stable oscillator have constant amplitude and frequency. A common criteria is the Barkhausen stability criteria, wherein it states that loop gain should be unity and feedback should be positive.