Question
Download Solution PDFOne of the criteria for oscillations to occur in an amplifier is that:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct option is 2.
Concept:
- The output of the oscillator will not depend upon input voltage because there is no input voltage for an oscillator
- An oscillator is an amplifier circuit with positive feedback in which a part of the output is feedback to the input via a feedback circuit
- It should satisfy Barkhausen criteria |Aβ| \(\geq\) 1, where A is the amplifier gain and β is the feedback gain
Barkhausen Criterion 'or' Conditions for Oscillation:
The circuit will oscillate when two conditions, called Barkhausen’s criteria are met. These two conditions are:
- The loop gain must be unity or greater.
- The feedback signal feeding back at the input must be phase-shifted by 360° (which is the same as zero degrees). In most of the circuits, an inverting amplifier is used to produce 180° phase-shift and an additional 180° phase shift is provided by the feedback network.
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