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How does the input impedance of a field-effect transistor (FET) compare with that of a bipolar transistor?
An FET has high input impedance a bipolar transistor has low input impedance
FETs are voltage-controlled devices with an insulated gate (MOSFET) or reverse-biased junction (JFET), resulting in very high input impedance. Bipolar transistors are current-controlled with a forward-biased base-emitter junction, resulting in lower input impedance.
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