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Unformatted text preview: Test 1  Winter 1995  M. Cahay Name: m ELECTRONICS I
. January 23, 1995 I. The ﬁgure below shows a voltage source connected to the input of an ampli
ﬁer. R, is the source resistance. R. and C. are the input resistance and input capacitance of the ampliﬁer, respectively. Derive an expression for V;(s)/V.(s)
and show that it is a. lowpass STC type. Find the 3dB frequency for the case where R, = 51:51, = 200169, and C, = 20pF. (25 pts). ﬁgzstiz V k
Brunch—n— cub ; ‘30; 41 L 20%“
Cf: ZOFF {wkasha LOPF ' .eo)ooo (0‘5 “317.
Q‘s—"°q ' as: 6H'
= ~—— . e «50,000 2h" ’ I o 5; L63 H2~ 5H3 II. In the diagrambelow the opamp is assumed to be ideal and all resistors
are assumed to be equal to 10 for simplicity. Find an expression of 1);, in terms of v; and v2. Hint: Use the principle of superposition.(30f’7>) III. A designer has available voltage ampliﬁers having an input resistance of
101:9, an output resistance of 11:9, and an opencircuit voltage gain of 10.
The signal source has a 101:9 resistance and provides 10 mV rms signal. If it
is required to provide a signal of at least 2V ms to a 11:0 load, how many
ampliﬁer stages are required? For this number of ampliﬁers, what is the actual output voltage? ['50
in 12.0. ‘ lkn. . IV. Consider a voltage follower (buffer ampliﬁer) built with an ideal opamp
except for having a ﬁnite voltage gain A. Calculate the value of the close
loop gain for A=10,100, and 1000. In each case calculate the % error in gain
magnitude compared to the gain obtained with an ideal opamp. ( 15 ...
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This note was uploaded on 04/09/2008 for the course ECEE 351 taught by Professor Cahay during the Fall '97 term at University of Cincinnati.
 Fall '97
 Cahay

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