Question

In an oscillator, for sustained oscillations, Barkhausen criterion is Aβ equal to ______.

(A = voltage gain without feedback and β feedback factor)

Options

• zero

• `1/2`

• 1

• 2

Answer 1

In an oscillator, for sustained oscillations, Barkhausen criterion is Aβ equal to 1.

(A = voltage gain without feedback and β feedback factor)

Explanation:

If A is the circuit's amplifying element's gain and B is the feedback path's transfer function, then the Barausen criterion states that the condition of sustained oscillation is |βA| = 1.