The MOSFET in the Common-Source Amplifier in Fig $g_{m}=$ $5 \mathrm{~mA} / \mathrm{V}, r_{o}=20 \mathrm{k} \Omega, C_{g s}=5 \mathrm{pF}$

The MOSFET in the common-source amplifier in Fig. 10.6.1


Figure 10.6.1
has $g_{m}=$ $5 \mathrm{~mA} / \mathrm{V}, r_{o}=20 \mathrm{k} \Omega, C_{g s}=5 \mathrm{pF}$ , and $C_{g d}=1 \mathrm{pF}$ , and the total capacitance at the output node, $C_{L}$ , is $10 \mathrm{pF}$ .
(a) Find the value of the midband voltage gain.
(b) Use the method of short-circuit time constants to determine the lower 3-dB frequency, $f_{L}$ . Which capacitor dominates the determination of $f_{L}$ ?
(c) Use the method of open-circuit time constants to determine the upper 3-dB frequency, $f_{H}$ . Which capacitor dominates the determination of $f_{H}$ ?

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(a) Figure 10.6.2 (above) shows the...

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