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# hw7 - UNIVERSITY OF CALIFORNIA College of Engineering...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences EE 105 Prof. Pister Spring 2011 Homework Assignment #7 Due in the 105 box on the 2 nd floor of Cory, 5pm Friday 3/11/2010 Problem 1: We talked about the problems with voltage and temperature variation affecting the bias point of a common emitter amplifier. In this problem, I’d like you to calculate and simulate the effect. For the circuit in Figure 5.55a, assume that the BJT has I S =10 -15 A, =100, and V A =100V. The supply is 2V, and R C =1M (don’t forget that M or m in spice is milli, and you need to use X to get mega). Enter all of your answers to problem 1 in the table below. Turn in printouts of your spice decks. There should be a separate spice deck for each problem e.g. hw7p1d.sp , hw7p1e.sp, etc. You will save yourself lots of headache by having separate files. A) Find the collector current necessary to bias the output at 1V. What base voltage gives you that current? B) Calculate g m , r , and r o . Calculate the “large signal” base current. Calculate the expected gain for the amplifier. C) Choose base bias resistors to generate the desired base voltage.

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hw7 - UNIVERSITY OF CALIFORNIA College of Engineering...

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