Mathematics · Electronic Devices

In a JFET self-bias configuration, the gate resistor is R G = 10 MΩ, and the input coupling network has resistors of 90 kΩ and 10 kΩ in parallel. The mid-frequency input impedance of the JFET amplifier is approximately:

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Correct answer

18 kΩ

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In a JFET self-bias configuration, the gate resistor is R G = 10 M&Omega;, and the input coupling network has resistors of 90 k&Omega; and 10 k&Omega; in parallel. The mid-frequency input impedance of the JFET amplifier is approximately: