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303S12hmwrk3

# 303S12hmwrk3 - results a With parameterized Rin for 100 ≤...

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File: f:/coursesS12/303/303S12hmwk3.doc RWN 02/12/12 303 Spring 2012– Homework 3 Due M 02/20/12 in class 1. (40 points, BJT curves) a) For the following circuit run curves for IC versus VCC with 0 IB 40 uA in 10uA steps. b) If the Q points are at VCEnpn=3=-VCEpnp and |IC|=3mA, give the g m ’s g π ’s and g o ’s for both the npn and the pnp Qnpn Q2N3904 Qpnp Q2N3906 0 VCC 6Vdc IB 10uAdc CC Fn F GAIN = -1 Bn mid Fp F GAIN = 1 Bp in 2. (60 points, Current Mirrors) In the following circuit from Homework 2 replace the transistors by BJTs (2n3904 & 2n3906). Use PSpice DC runs varying Vdd near 5V to obtain the desired
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Unformatted text preview: results. a) With parameterized Rin for 100 ≤ Rpar ≤ 100K in logarithmic steps, 1 curve per step, determine the resulting currents into all the transistors. Show the ICn’s in one plot and the ICp’s in another) b) Over the same range of Rin determine the voltages at in, mid, and out c) Since the currents are supposed to be equal, explain why they are not. Rin {Rpar} Vss-5Vdc Vdd 5Vdc Mp1 M4007P ss dd in mid out PARAMETERS: Rpar = 1K Mn M4007N Mp2 M4007P Mn1 M4007N Mn3 M4007N...
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