6) Consider an n-channel metal oxide semiconductor field effect transistor made out of silicon and operated at 300K. Its characteristic curves are shown in the figure below. a) From the figure, estimate the threshold voltage. b) From the figure, calculate the channel conductance at a gate voltage of 3.5 V and very low drain to source voltage. c) Calculate the transconductance at a gate voltage of 3.5 V. d) From the answers to parts b or c calculate the ratio of width to length of the transistor assuming the gate oxide thickness is 8 nm. e) Calculate the saturation current at a gate voltage of 2.2 V.
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The approach will be general, assuming a common understanding of MOSFET operation and characteristic curves. ### a) Estimate the Threshold Voltage ** 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 $v_{\text {sat }}=4 \times 10^{6} \mathrm{~cm} / \mathrm{s}$.
12. A base current of 50 μA is applied to the transistor in Figure 4–53, and a voltage of 5 V is dropped across RC. Determine the βDC of the transistor. 13. Calculate αDC for the transistor in Problem 12. 14. Assume that the transistor in the circuit of Figure 4–53 is replaced with one having a βdc of 200. Determine IB, IC, IE, and VCE given that VCC = 10 V and VBB = 3 V. 15. If VCC is increased to 15 V in Figure 4–53, how much do the currents and VCE change? 29. Determine IC(sat) for the transistor in Figure 4–58. What is the value of IB necessary to produce saturation? What minimum value of VIN is necessary for saturation? Assume VCE(sat) = 0 V.
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A power MOSFET is connected in a common-source configuration as shown in Figure $15.26 .$ The transistor parameters are $K_{n}=0.20 \mathrm{~A} / \mathrm{V}^{2}, V_{T}=2 \mathrm{~V}, I_{D, \text { mas }}=8 \mathrm{~A}$, $B V_{D S s}=80 \mathrm{~V}$, and $P_{T}=45 \mathrm{~W}$. The circuit parameters are $V_{D D}=60 \mathrm{~V}$ and $R_{L}=10 \Omega .(a)$ Sketch and label the safe operating area for the transistor using linear current and voltage scales. Sketch the load line on the same curve. $(b)$ Calculate the power dissipated in the transistor for $V_{a s}=4,6$, and $8 \mathrm{~V}$. Is there a possibility of damaging the transistor? Explain.
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