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# assignmen5 - m c Replace the transistor with the hybrid...

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ECED3201: Introduction to Electronics Fall 2007 Dalhousie University, Department of Electrical and computer Engineering Assignments #5 In all the following problems neglect r o (r o = ). 1- We wish to analyze the amplifier shown in Fig. 1. Assume =100, V BE 0.7V for the dc analysis. a) Find the voltage gain A v =v o /v i b) Consider v i (t) a sinusoidal signal with 10kHz frequency and 500 mV of amplitude. Find the expressions for the total instantaneous quantities v C (t), v B (t), i C (t), and i B (t). Fig.1 2- The transistor amplifier shown in Fig. 2 is biased with a constant current source I and has a very high . a) Find the dc voltage at the collector V c . b) Find the value of g

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Unformatted text preview: m . c) Replace the transistor with the hybrid- model, shown in lecture 5 page 30, and find the voltage gain A v =v c /v i . (note that the dc current source I should be replaced with an open circuit for ac analysis) C B Fig.2 3- For the emitter follower in Fig. 3, the signal source is directly coupled to the transistor base. a) If the dc component of v sig is zero, find the dc emitter current. Assume = 100 (consider V BE 0.7V for the dc analysis) . b) Find the input resistance R in . c) Find the voltage gain A v =v o /v sig . Fig.3 Due date: Nov. 14, 2007. Late submission will not be accepted....
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assignmen5 - m c Replace the transistor with the hybrid...

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