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# HW7sol10 - ECE2280 Homework#7 Spring 2010 1 The terminal...

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1 ECE2280 Homework #7 Spring 2010 1. The terminal voltages of various npn transistors are measured during operation in their respective circuit with the following results: Case E B C Mode 1 0 0.7 0.7 beginning of active 2 0 0.8 0.1 saturation 3 -0.7 0 0.7 beginning of active 4 -0.7 0 -0.6 saturation 5 -2.7 -2.0 0 active 6 0 0 5.0 cutoff In this table, where the entries are in volts, 0 indicates the reference terminal to which the black (negative) probe of the voltmeter is connected. For each case, identify the mode of operation of the transistor. 2. For each of the circuits shown in the circuit below, find the emitter, base, and collector voltages and currents. Use β =50, but assume |V BE |=0.8V.

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2 3. For the circuits below, find values for the labeled node voltages and branch currents. Assume β to be very high.
3 4. For the circuit below, use β =100. Assume active mode and find I E, V E, I B, V B, I C, V C . (The currents through all branches and voltages at all terminals of the BJT) ( ) 5 , 333 , 0.7, 3 , 5 1 5 0.7 1.29 33.3 3 101 ( 1) (1.29 )(3 ) 3.87 1.29 12.8 101 0.7 3.87 4.57 0.99(1.29 ) BB BB BE E C BB B BB BE

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