# ece hw3 - BIAS is 10V what value should the resistor be to...

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1 University of Massachusetts Department of Electrical and Computer Engineering ECE 323 Electronics I Fall 2010 Problem Set 3: Bipolar Transistors Do and the following problems from Sedra and Smith: Turn in only the problems marked with * 5.80(a), 5.82*( β = 50 only), 5.84(b)* Also, do all of the following problems, but turn in only problems 1 and 3. Problem 1* : Calculate the node voltages for the circuits below assuming Beta=100 and V eb =0.7. Be sure to state and test your assumptions. Figure 1: PNP Transistor Circuits Problem 2: Figure 3 shows a current source that is often used in discrete circuit designs. Figure 2: Current Source If V

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Unformatted text preview: BIAS is 10V, what value should the resistor be to make I OUT equal to 10mA? Draw the circuit labeling all currents and voltages. Assume Beta=100, |V BE |=0.7, and that the op-amp is ideal. 2 Problem 3* : Find the voltages V x and V y . Assume a constant voltage drop model for the diode and β = 100 for the transistor. Figure 3 Problem 4 : Here NPN and PNP transistors work together to form a buffer. Assuming Beta=100 and |V BE |=0.7V, solve for the conditions below showing your work and justifying your assumptions. Figure 1: Two-Transistor Voltage Buffer 4.1) What is V OUT when I OUT =0? 4.2) What is V OUT when I OUT =-10mA?...
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## This note was uploaded on 10/27/2011 for the course ECE 323 taught by Professor Oliai during the Fall '07 term at UMass (Amherst).

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ece hw3 - BIAS is 10V what value should the resistor be to...

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