In a Common Drain (CD) MOSFET amplifier with voltage divider bias

In a Common Drain (CD) MOSFET amplifier with voltage divider bias
| In a Common Drain (CD) MOSFET amplifier with voltage divider bias with R1 and R2 equal to 1.5 MΩ and 1 MΩ respectively, the input impedance Zf is:

A. 220 kΩ 

B. 600 kΩ 

C. 470 kΩ 

D. 200 kΩ 

Please scroll down to see the correct answer and solution guide.

Right Answer is: B

SOLUTION

Common drain Amplifies with voltage divider bias and its small-signal equivalent circuit is as shown below:

Calculation:

Given:

R1 = 1.5 MΩ, R2 = 1 MΩ

So,

\({R_{in}} = \frac{{{R_1} \cdot {R_2}}}{{{R_1} + {R_2}}}\)

\({R_{in}} = \frac{{1.5\;M{\rm{\Omega }} \times 1M\;{\rm{\Omega }}}}{{2.5\;M{\rm{\Omega }}}}\)

Rin = 600 kΩ 

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