Question
Download Solution PDFIf an amplifier circuit has negative feedback, then gain:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFTransistor as an Amplifier
A transistor is a 3-terminal device i.e. base, collector, and emitter
When the base-emitter junction is forward-biased and the collector-emitter is reversed-biased, the transistor acts as an amplifier.
The working of the amplifier is based on negative feedback.
In a negative feedback circuit, some part of the output is fed back to the input.
Explanation
The closed loop gain for negative feedback is given by:
where, Af = Closed loop gain
A = Open loop gain
M = Feedback factor
So, when negative feedback amplifier, the gain reduces by the factor (1+AM)
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