# Test 2 - ELECTRONICS I I Assuming that the diodes in the circuit below are ideal ﬁnd the values of the labelled voltages and currents Indicate

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Unformatted text preview: ELECTRONICS I November 15, 1996 I. Assuming that the diodes in the circuit below are ideal, ﬁnd the values of the labelled voltages and currents. Indicate next to each diode if it is ON or OFF. Explain. +lQV 70 v z fl '2 7m :2: ID, ? “MAL/Yr V,< 0V V1 : *lOV V. II. A single measurement indicates that the emitter voltage of the transistor in the circuit below is 1.0 V. Assuming that V3}; is 0.7 V, calculate VB, I 3, IC, ﬂ, and a. +SV III. The transistor ampliﬁer shown below is biased with a constant current source I and has a very high ,6. Find the dc voltage at the collector. Also, calculate gm. Replace the circuit by its hybrid-1r model (neglect 1'0) and ﬁnd the voltage gain vc/vg. +5v k T 313 ’ v, is a small sine-wave signal with zero dc value. Furthermore, ﬂ = 100. Find (a) value RE needed to establish a dc emitter ‘current of 1 mA; (b) R0 to establish a dc collector voltage of about 5V; (c) For RL = 5 kg and using r0 = 100 190, draw the small signal equivalent circuit of the ampliﬁer and, (d) determine its overall voltage gain, i.e, v0 / 12,. A +15V‘ IV. In the circuit below, a V D -m “Mn”, W43 4 ,_ , _ 0 UN 1" %{07 (Mg Y [loam 5;! n 0......” , .- ' [/1 <2“ Po: QM}: =q,(15 ks 53) 0‘ 2° , 1°“ , » ~ r u,‘ mi, * ggzkyi‘jgfﬂgtl' . 73K . F3 -3qgu0’3 {<K) ( \$65) » .(947- 14.44 V/v\ / / Vi,ﬁ%/’ \\_ ...
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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.

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Test 2 - ELECTRONICS I I Assuming that the diodes in the circuit below are ideal ﬁnd the values of the labelled voltages and currents Indicate

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