05 CMOS Gate Delay

05 CMOS Gate Delay - EE115C Digital Electronic Circuits...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
EE115C Digital Electronic Circuits Lecture 5: CMOS Gate Delay
Background image of page 1

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

View Full DocumentRight Arrow Icon
EE115C 2 2 pHL pLH p t t t Delay Definitions
Background image of page 2
3 V out R on DD in = C L 0.69 pHL on L t R C 0.36 0.5 1 R on C L t V out V DD CMOS Inverter Propagation Delay MOS Resistance Model EE115C () ON t R C out DD V t V e
Background image of page 3

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

View Full DocumentRight Arrow Icon
4 Recall: Transistor Equivalent Resistance V GS V T S D R on     2 1 2 1 2 1 DD DSAT DD DD DSAT DD eq V I V V I V R DD DSAT DD eq V I V R 6 5 1 4 3 I D V DS V DD V DD /2 V GS = V DD R mid R 0   0 2 1 R R R mid eq Traversed path EE115C
Background image of page 4
5 0 0.5 1 1.5 2 2.5 x 10 -10 -0.5 0 0.5 1 1.5 2 2.5 3 t (sec) V out (V) t pLH t pHL Realistic Inverter Transient Response EE115C
Background image of page 5

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

View Full DocumentRight Arrow Icon
6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 V DD (V) t p (normalized) How to Reduce t P : Increase V DD ) 2 ( ' ) ( 52 . 0 4 3 69 . 0 DSATn Tn DD DSATn n n DD L DSATn DD L pHL V V V V k L W V C I V C t R eq EE115C
Background image of page 6
7 1 1.5 2 2.5 3 3.5 4 4.5 5 3 3.5 4 4.5 5 x 10 -11 b t p (sec) How to Reduce t P : Choose NMOS/PMOS Ratio tpLH tpHL tp b = W p /W n EE115C
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

05 CMOS Gate Delay - EE115C Digital Electronic Circuits...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online