EEE6323S13-HW3

# Use hand calculations 3 determine the input

This preview shows pages 2–3. Sign up to view the full content.

VTC. Use hand calculations. (3) Determine the input capacitance of INV1. Use hand calculations. (4) Simulate the circuit in TSMC 0.25um process and check whether your initial sizing estimates are approximately correct. Resize if necessary.

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

View Full Document
Now assume a 1000 of these latches are used in a synchronous datapath design and are connected such that CKgrid drives the clock input of all 1000 latches (i.e. fanout of a 1000, or FO1000), as shown in the figure below. (5) Determine the size of INV0 such that the rise/fall times at the CKgrid node is less than 200ps. NOTE: approximate the total load capacitance as C CKgrid =1000x C INV1 from part (3). (6) Determine the peak current into the load C CKgrid =1000x C INV1 . HINT: use I=CdV/dt for hand calculations. Also, simulate the inverter size in SPICE and plot the peak current. In your opinion, what are the implications of having large current transients? D Q CK grid D Q CLK INV1 Latch N1 P1 P2 P3 P4 N2 N3 N4 N5 INV2 P5 P6 N6 CKb CK D Q CKgrid INV0 Fanout =1000
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