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Ideal voltage amplifier- Input resistance
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Q. What should be the value of input resistance for an ideal voltage amplifier circuit?
- Published on 23 Sep 15
a.
Zero
b.
Unity
c.
Infinity
d.
Unpredictable
ANSWER: Infinity
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Discussion
Satyawati
-Posted on 30 Sep 15
An amplifier which generates an output voltage proportional to the input voltage in such a way that the proportionality factor is independent of magnitude of source load resistances, is known as 'Voltage amplifier'.
Ideally, the value of input resistance must be infinite while the value of output resistance must be zero in order to yield maximum amplified voltage gain.
But, practically, it can be inferred that the voltage amplifier must have large value of input resistance and a small value of output resistance.
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