Vcc = 22V R1 91M? RD 2.2k? R2 11M? RS 1k? C C Vo Vi Zo Zi
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Calculate the transconductance (gm) of the MOSFET using the given values of Rd and μ. gm = μ / Rd = 122 / 47kΩ = 0.0026 A/V Show more…
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An n-channel MOSFET has the following parameters: $$ \begin{aligned} \mu_{n} &=400 \mathrm{~cm}^{2} / \mathrm{V}-\mathrm{s} & t_{\mathrm{ox}} &=500 \AA \\ L &=2 \mu \mathrm{m} & & W=20 \mu \mathrm{m} \\ V_{T} &=+0.75 \mathrm{~V} & & \end{aligned} $$Assume the transistor is biased in the saturation region at $V_{G S}=4 \mathrm{~V} .(a)$ Calculate the ideal cutoff frequency. (b) Assume that the gate oxide overlaps both the source and drain contacts by $0.75 \mu \mathrm{m}$. If a load resistance of $R_{L}=10 \mathrm{k} \Omega$ is connected to the output, calculate the cutoff frequency. Repeat Problem $10.56$ for the case when the electrons are traveling at a saturation velocity of $v_{\text {sat }}=4 \times 10^{6} \mathrm{~cm} / \mathrm{s}$.
A CS amplifier utilizes a MOSFET with $\mu_{n} C_{o x}=400 \mu \mathrm{A} / \mathrm{V}^{2}, W / L=10,$ and $V_{A}=10 \mathrm{V} .$ It is biased at $I_{D}=0.2 \mathrm{mA}$ and uses $R_{D}=6 \mathrm{k} \Omega$. Find $R_{\mathrm{in}}$ $A_{y o},$ and $R_{o} .$ Also, if a load resistance of $10 \mathrm{k} \Omega$ is connected to the output, what overall voltage gain $G_{v}$ is realized? Now, if a $0.2-\mathrm{V}$ peak sine-wave signal is required at the output, what must the peak amplitude of $v_{\mathrm{sig}}$ be?
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An n-channel MOSFET has the following parameters: $N_{a}=5 \times 10^{16} \mathrm{~cm}^{-3}$, $t_{a x}=15 \mathrm{~nm}=150 \AA, \mu_{n}=450 \mathrm{~cm}^{2} / \mathrm{V}-\mathrm{s}, V_{F B}=-0.5 \mathrm{~V}, L=1.2 \mu \mathrm{m}$, and $W=8 \mu \mathrm{m}$ (a) Determine the body-effect coefficient. (b) Plot $\sqrt{I_{D}(s a t)}$ versus $V_{G s}$ over the range $0 \leq I_{D} \leq 0.5 \mathrm{~mA}$ for source-to-body voltages of $(i) V_{S B}=0,($ ii $) V_{S B}=1 \mathrm{~V}$, (iii) $V_{S B}=2 \mathrm{~V}$, and $(i v) V_{S B}=4 \mathrm{~V} .(c)$ What are the threshold voltages for the conditions given in part $(b) ?$
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