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# HW_03 - EE/CE 3311 Electronic Circuits Homework 3 Assigned...

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EE/CE 3311 Electronic Circuits Homework # 3 Assigned on 02/17/2010 Due on 02/24/2010 For all the problems, unless stated otherwise, assume that the bipolar transistor operates in the forward active region. Problem #1 (5 points) Suppose the voltage-dependent current source of Fig. 1-1 is constructed with K = 20 mA/V. What value of load resistance is necessary to achieve a voltage gain of 15? Fig. 1-1. Problem #2 (10 points) Consider the ‘amplifier’ in Fig. 2-1. A resistance R S is placed in series with the input voltage source. (a) Determine V out / V in . (b) What happens if r in and K are related: r in = a / x and K = bx . Plot the voltage gain as a function of x . Fig. 2-1.

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Problem #3 (10 points) In the circuit of Fig. 3-1, it is observed that the collector currents of Q 1 and Q 2 are equal if V BE1 V BE2 = 20 mV. Determine the ratio of transistor cross-section areas if the other device parameters are identical. Fig. 3-1.
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HW_03 - EE/CE 3311 Electronic Circuits Homework 3 Assigned...

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