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# 18 55041 electronic circuits the university of iowa

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Unformatted text preview: sign the circuit, by specifying values for , and (8 points) and , such that Sketch the dc load line and plot the Q-point. (6 points) = 0.25 mA/V2 and The parameters for the transistor are Solution ⁄( The voltage drop across is 4 V, so that operating in the saturation region. Then [ . Assume the transistor is ( [ , since the other solution has FET is off. The gate current is zero so that and ( Also, Thus, below. ( , which implies the . Thus, ( ( ( . so that the transistor is indeed in saturation. The dc load line is shown 19 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 17 Consider the circuit below. The characteristics for the FET are also shown. In the circuit , , and . (a) Determine (2 points) (b) Write the dc load line equation for the FET (2 points) (c) Draw the dc load line equation on the FET characteristics, indicating the Q-point. (2 points) (d) Is the FET operating in the saturation region? (2 points) Solution Part (a) No gate current flows, so ⁄ ⁄ Part (b) ( ⁄ Part (d) The Q-point is where the dc load line intercepts the FET characteristics with For the figure is it clear the FET in not operating in the saturation region. 20 . 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 18 The transistor characteristics for an NMOS FET are shown below. (a) Is this an enhancement- or depletion-mode device? (2 points) (b) Estimate a value for . (6 points)...
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