hw10_soln - UNIVERSITY OF CALIFORNIA AT BERKELEY College of...

This preview shows pages 1–2. Sign up to view the full content.

UNIVERSITY OF CALIFORNIA AT BERKELEY College of Engineering Department of Electrical Engineering and Computer Sciences Homework #10 Solutions Due Tuesday, November 6, 2007 EE 105 Fall 2007 Prof. Liu Problem 1. MOSFET Body Effect a) V TH = V TH 0 + γ parenleftBig radicalbig 2 φ B + V SB radicalbig 2 φ B parenrightBig V TH = 0 . 5 V V TH 0 = V FB + 2 φ B + 1 C ox radicalbig 2 s N A 2 φ B φ B = (60 mV) log ( N A /n i ) = 480 mV C ox = ǫ ox /t ox = 1 . 38 μ F / cm 2 V TH 0 = 0 . 362 V γ = 1 C ox radicalbig 2 qN A ǫ s = 0 . 410 V SB = 0 . 773 V b) Reverse biasing the body-source PN junction would increase the short-channel effect. By reverse biasing the body-source junction, the reverse-bias on the body-drain junction is also increased. Thus, reverse body biasing exacerbates the “short channel effect” of | V TH | re- duction with decreasing L , because the depletion charge supported by the source and drain junctions is increased (hence the depletion charge supported by the gate is decreased signifi- cantly).

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