Lecture12-InverterDelay+Energy

Lecture12-InverterDelay+Energy - EE141 1 EE141 EECS141 1...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: EE141 1 EE141 EECS141 1 Lecture #12 EE141 EECS141 2 Lecture #12 HW 4 Due Today. New HW today as well. Final Lab next week Project to be launched on Wednesday! Probably is wise to be in class that day. EE141 2 EE141 EECS141 3 Lecture #13 EE141 EECS141 4 Lecture #13 0.5 1 1.5 2 2.5 0.5 1 1.5 2 2.5 V in (V) V out (V) Wider PMOS Wider NMOS Symmetrical EE141 3 EE141 EECS141 5 Lecture #13 0.5 1 1.5 2 2.5 0.5 1 1.5 2 2.5 V in (V) V out (V) Fast PMOS Slow NMOS Fast NMOS Slow PMOS Nominal EE141 EECS141 6 Lecture #13 Not all transistors are alike Impacts parameters such as reliability and performance Define process corners: SS, FF, SF, FS EE141 4 EE141 EECS141 7 Lecture #13 7 EE141 EECS141 8 Lecture #13 We modeled this with: C Discharging a capacitor t p = ln (2) RC EE141 5 EE141 EECS141 9 Lecture #13 Real transistors arent exactly resistors Look more like current sources in saturation Two questions: Which region of IV curve determines delay? How can that match up with the RC model? EE141 EECS141 10 Lecture #13 With a step input: I D V DS V DD V DD /2 V GS = V DD V DD V DD/2 V VSAT Transistor is in (velocity) saturation during entire transition from V DD to V DD /2 EE141 6 EE141 EECS141 11 Lecture #13 In saturation, transistor basically acts like a current source: I DSAT C V OUT V OUT = V DD- (I DSAT /C)t V OUT t V DD V DD /2 t p t p = C(V DD /2)/I DSAT EE141 EECS141 12 Lecture #13 EE141...
View Full Document

This note was uploaded on 02/06/2011 for the course EE 141 taught by Professor Staff during the Spring '08 term at University of California, Berkeley.

Page1 / 19

Lecture12-InverterDelay+Energy - EE141 1 EE141 EECS141 1...

This preview shows document pages 1 - 7. Sign up to view the full document.

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