Question 17.SG.Q.5: The AC schematic of an NMOS common source stage is shown in ......
The AC schematic of an NMOS common source stage is shown in the following figure, where part of the biasing circuits has been omitted for simplicity. For the N-channel MOSFET M, the transconductance g_m = 1 mA/V, and body effect and channel length modulation effect are to be neglected. The lower cut-off frequency (in Hz) of the circuit is approximately at
(a) 8 (b) 32
(c) 50 (d) 200
Step-by-Step
The lower cut-off frequency f_L is given by
\begin{aligned}f_{L}&=\frac{1}{2 \pi\left(R_{L}+R_{D}\right) C}\\&=\frac{1}{2 \times 3.14 \times\left(10 \times 10^3+10 \times 10^3\right) \times 1 \times 10^{-6}}=8 Hz\end{aligned}
Ans. (a)
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