Which of the following devices has the highest input impedance ?
Correct answer: B. MOSFET
- A. JFET
- B. MOSFET
- C. Crystal diode
- D. ordinary transistor
Explanation
A MOSFET has the highest input impedance because its insulated gate draws essentially no input current. A JFET also has high input impedance, but its reverse-biased gate junction is not as well insulated as a MOSFET gate.
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