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Unformatted text preview: . 10 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 8 An nchannel MOSFET with
,
saturation region with
. Determine the transconductance
1 mV, by how does the drain current change? (6 points)
Solution
√
√( ( ( ( 11 is biased to operate in its
. If
changes with 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 9 The nchannel MOSFET in the circuit below has
a)
b)
c)
d) , Assuming the FET is operating in its saturation region, show that
Determine the transconductance
.
If
what is the corresponding change in drain current?
If
what is the corresponding change in drain voltage? .
. (12 points) Solution
Part (a)
(
( ( Part (b)
√
√( ( Part (c)
( ( Part (d)
( ( 12 55:041 Electronic Circuits. The University of Iowa. Fall 2011. Problem 10 You are a student taking the PEI course at The University of Iowa. As part of a
laboratory exercise, you must measure the input resistance
of an amplifier. You are provided
a signal generator, and learn from the amplifier’s datasheet that the gain
, and the input
resistance is around 100K. Describe, using a figure and equations as needed, how to perform
this task. (5 points)
Solution
Set up the following circuit. Pick
100K. Set the signal generator amplitude
and measure, using a high impedance voltmeter or oscilloscope, the voltage and Then, the current flowing through The values for and is ⁄ ( are not critical. 13 , and ,
. 55:041 Electronic Circuits. The University...
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 Fall '11
 Kruger

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