Question

The output curves of an $n$-channel MOSFET are shown in Figure P11.32(a). This transistor is placed in the circuit in Figure P11.32(b). (a) What mode device is this MOSFET? (b) If we wish to put the $Q$-point on the $V_{G S}=0.5 \mathrm{~V}$ curve, what value of $R_S$ should be selected? Hint: First compute $V_G$; then write an equation for $V_{G S}$ and use it to solve for $R_S$. (c) Construct the dc load line on the output curves. (d) Obtain the $Q$-point of the circuit. (e) Construct the ac load line. (f) Sketch the output voltage for a triangular input voltage of $1 \mathrm{~V}$ peak-to-peak. (g) Find the large-signal voltage gain. Figure P11.32 can't copy

   The output curves of an $n$-channel MOSFET are shown in Figure P11.32(a). This transistor is placed in the circuit in Figure P11.32(b). (a) What mode device is this MOSFET? (b) If we wish to put the $Q$-point on the $V_{G S}=0.5 \mathrm{~V}$ curve, what value of $R_S$ should be selected? Hint: First compute $V_G$; then write an equation for $V_{G S}$ and use it to solve for $R_S$. (c) Construct the dc load line on the output curves. (d) Obtain the $Q$-point of the circuit. (e) Construct the ac load line. (f) Sketch the output voltage for a triangular input voltage of $1 \mathrm{~V}$ peak-to-peak. (g) Find the large-signal voltage gain.
Figure P11.32 can't copy

Essentials of Electrical and Computer Engineering

David V. Kerns, Jr.,… 1st Edition

Chapter 11, Problem 32

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Step 1

To determine the mode of the MOSFET, we need to check the gate-source voltage $ V_{GS} $ and the threshold voltage $ V_{th} $. If $ V_{GS} > V_{th} $, the MOSFET is in the saturation or triode region; if $ V_{GS} < V_{th} $, it is in the cutoff region. Show more…

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The output curves of an $n$-channel MOSFET are shown in Figure P11.32(a). This transistor is placed in the circuit in Figure P11.32(b). (a) What mode device is this MOSFET? (b) If we wish to put the $Q$-point on the $V_{G S}=0.5 \mathrm{~V}$ curve, what value of $R_S$ should be selected? Hint: First compute $V_G$; then write an equation for $V_{G S}$ and use it to solve for $R_S$. (c) Construct the dc load line on the output curves. (d) Obtain the $Q$-point of the circuit. (e) Construct the ac load line. (f) Sketch the output voltage for a triangular input voltage of $1 \mathrm{~V}$ peak-to-peak. (g) Find the large-signal voltage gain. Figure P11.32 can't copy

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