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Unformatted text preview: Test 2  Winter 1995 ~ M. Cahay Name: ELECTRONICS I
February 14, 1995 I. For the circuits shown below, ﬁnd the labelled voltages and currents assum
ing the ideal model for each diode. Explain. II. Assume that the transistor in the ﬁgure below has a very large 3. Starting
with the known values of the voltages indicated on the ﬁgure, ﬁnd the value
of I3 and V4. III. The transistor below has a ,3 of 100. Also, Vac is 9 V, R1 = 271:9,
R2 = 151:0, R5 = 1.21:0, and RC = 2.2“). Calculate the dc biasing current
[3. Assuming that R5 = 101:0 and R], = 21:11, use the hybridr model and
draw the ampliﬁer equivalent circuit. Calculate R;, G.” R.” A., and A;. (i.e, no DC component to the input signal). The transistor has a 3 of l . 7 o What value of R3 is needed for the emitter current to be 1 mA,
0 What Re is needed to have a collector voltage of about 5% 0 Assuming that R; = 51:9, and r0 = 100“), draw the smallsignal equiv
alent circuit of the ampliﬁer and ﬁnd its voltage gain vo/v,. IV. In the circuit shown below, 27. is a small sine wave with zero average g“) +i$V ...
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 Fall '97
 Cahay

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