{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

final_2002

This preview shows pages 1–4. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
Part a, 10 points 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.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern