20085ee115C_1_hw_6

# 20085ee115C_1_hw_6 - EE115C Homework#6 Due 12 noon...

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

EE115C – Homework #6 Due 12 noon 12/05/2008 Problem #1 Wires A trace of metal-5 wire has characteristics of C W ’ (per length) = (0.15+0.05*width) fF/ µ m, and R W (a) For a 1.0- µ m wide wire trace, determine the delay for a trace with length of 1mm, 2mm, and 3mm. Assume that the trace is driven by an inverter of size W ’ (per length) = (0.15/width) / µ m. The “width” in the equations are with units of microns. P =10 µ m and W N =4 µ m. The same inverter is at the end of the trace. Assume that C’ G =2fF/ µ m, C’ D =1fF/ µ m, R’ N =1.0k - µ m and R’ P (b) If the 3-mm long trace in part-(a) has inverters of the same size as part-(a) inserted every 1mm. Determine the delay through the 3mm wire. =2.5k - µ m. (c) What is the optimal inverter size to minimize delay? Note that this was not covered in lecture, but is in your textbook. Note the importance of buffer insertion to reduce delay! Problem #2 FlipFlops A positive edge triggered flipflop is shown below. All sizes are in microns (and minimum channel lengths). Assuming that R’ N_DN (NMOS pull-down)=1.0k - µ m and R’ P_UP (PMOS pull-up)=2.5k - µ m and ignore velocity saturation. Also assume that R’ N_UP (NMOS pull-up)=2.5*R’ N_DN (NMOS pull-down) and R’ P_DN (PMOS pull-down)=2.5*R’ P_UP (PMOS pull-up). And, C’ G =C’ D = 2fF/ µ

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