# hw6 - October 25, 2011 ECEN 325 Homework #6 Due: 11-3-2011,...

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October 25, 2011 ECEN 325 Homework #6 Due: 11-3-2011, 8:00AM Homeworks will not be received after due. Instructor: Sam Palermo 1. (25 points – 15pts calc., 10pts PSpice) BJT DC Operating Points and AC small signal parameters. a) For the BJT circuit below, calculate the DC values for V C , V B , V E , I C , I B , and I E . Compute the AC small signal parameters g m , r π , r e . Assume the transistor β=150 , V BE =0.7V , and V th =25.9mV . b) Verify the DC operating points in PSpice. R B1 10V R C I C V B 3k 200k R E1 R E2 R B2 100k V C 100 2k V E I B I E 2. (25 points – 15pts calc., 10pts PSpice) Common Emitter Amplifier. a) For the common emitter amplifier below, calculate the small signal gain A v =v o /v i (from the transistor base to the output node), the input resistance R in , the output resistance R out , and the overall voltage gain G v =v o /v s (from the voltage source to the output node). Assume that the capacitors act as AC shorts and that the transistor’s r o is infinite (can be neglected).

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## This note was uploaded on 01/01/2012 for the course ECEN 325 taught by Professor Silva during the Spring '08 term at Texas A&M.

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hw6 - October 25, 2011 ECEN 325 Homework #6 Due: 11-3-2011,...

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