Semiconductor Electronics Materials Devices And Simple Circuits Ques 93
93. An oscillator is nothing but an amplifer with
[1994]
(a) positive feedback
(b) negative feedback
(c) large gain
(d) no feedback
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Answer:
Correct Answer: 93.(a)
Solution:
- (a) A positive feed back from output to input in an amplifier provides oscillations of constant amplitude.
Due to the presence of some in herent electrical resistance amplitude of oscillation decreases. In order to obtain oscillations of constant amplitude, an arrangement for positive feedback from the output circuit to the input circuit so that the losses in the circuit can be compensated.
BETA
