Discussion
Assertion (A): Assertion: A field effect transistor's input impedance is far higher than a bipolar transistor's.
Reason (R): Reason: Its gate is either insulated or reverse biased and draws essentially no current.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason: with no gate current, the input impedance is set by whatever bias resistor the designer fits rather than by the device. That is why a field effect input stage can present megohms while a bipolar one presents kilohms. A specification the designer chooses directly is more valuable than one inherited from the device, and this is the clearest example in the subject. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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