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# Test 2 - Test 2 Winter 1995 ~ M Cahay Name ELECTRONICS I I...

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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 hybrid-r 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 small-signal 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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