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EE214 Winter 04/05
Handout #19
B. Murmann
Page 1 of 2
HOMEWORK #5
(Due: Monday, November 1, 2004, noon PT)
1. In class we have seen that in a negative feedback system, the fractional change in
closed loop gain equals the fractional change in forward gain divided by (1+af).
a) Using simple calculus, derive an expression for the fractional change in closed
loop gain as a function of fractional change in f.
b) Are variations in f also attenuated? Comment on the significance of this result.
2. Intrinsic gain charts. In the midterm design project, you will design a high gain
amplifier. In this problem you will use HSpice to generate appropriate design charts
that allow you to pick channel lengths based on gain requirements. Hint: use the
following HSpice line to compute intrinsic gain:
probe gmro = par('gmo(mn1)/gdso(mn1)')
a)
Generate an intrinsic gain plot (g
m
r
o
) for NMOS transistors. As in previous
homeworks, sweep V
GS
, use a diode connected device and channel lengths from
0.35…0.7
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This note was uploaded on 04/17/2008 for the course EE 214 taught by Professor Murmann,b during the Fall '04 term at Stanford.
 Fall '04
 Murmann,B
 Integrated Circuit

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