final_2002

final_2002 - ECE ECE145C (undergrad) and ECE218c (graduate)...

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ECE ECE145C (undergrad) and ECE218c (graduate) Final-Exam. Dec 13, 2002 Do not open exam until instructed to. Open book Use any and all reasonable approximations (5% accuracy is fine. ) , AFTER STATING THEM. Name: _______________________ 1
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Problem 1, 60 points RL A-level input B-level input Io Io Io Rcs=RL high low C C-bar You will be working on the circuit below, a CML inverter The circuits all use 3 um^2 transistors. Io is 3 mA in all cases. RL=Rcs=100 Ohms. The negative supply is -3.3 volts cbi C bb R be C ' ' e b m V g be R ex R + - ' ' e b V cbx C To the left is a hbt small-signal device model . Recall that . Let us take Cje=Cbe,depl=20 fF, beta=infinity, Ccbi=3 fF, Ccbx=2 fF, Rbb=50 Ohms, Rex=5 Ohms, and tau_f=0.5 ps. The transistor, has 3 um^2 emitter area f m je be g C C τ + = For large-signal analysis, we will take Ccbx, Ccbi, and Cbe,depl as having no variation with bias voltage. Vbe=0.7 volts at 1 mA/um^2 current density 2
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DC bias. RL A-level input B-level input Io Io Io Rcs=RL high low C C-bar Indicate the DC bias voltages on each node, assuming correct logical values on the A-level and B-level inputs. 3
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This note was uploaded on 08/06/2008 for the course ECE 145 taught by Professor Rodwell during the Fall '07 term at UCSB.

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final_2002 - ECE ECE145C (undergrad) and ECE218c (graduate)...

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