11a Pass Transistor Logic

# 11a Pass Transistor Logic - EE115C Digital Electronic...

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

EE115C igital Electronic Circuits Digital Electronic Circuits Lecture 11a: Pass Transistor Logic

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

View Full Document
Example: AND Gate ABF B 000 010 B A 1 0 0 111 F = AB 0 EE115C 2
General Pass Transistor Logic (PTL) B Switch Network Out Out A Inputs B B Allows primary inputs to drive S and D terminals ! 3 EE115C

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

View Full Document
PTL Problem #1 : Improper Switch C = 2.5 V C = 2.5 V A = 2.5 V B A = 2.5 V B M 2 M n C L M 1 ± V B does not pull up to 2.5V , but to 2.5V – V Tn 4 EE115C
PTL Problem #1 : Improper Switch (…contd.) 0 3.0 Out In ] In 5 /0 25 1.0 2.0 x Voltage [ V V DD Out x 0.5 μ m/0.25 μ m 0.5 μ m/0.25 μ m 1.5 μ m/0.25 μ m 0 0.5 1 1.5 2 0.0 Time [ns] 5 EE115C

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

View Full Document
Solution 1: Level Restoring Transistor D M r B V DD V DD Level Restorer M 2 M n Out A X M 1 ± Advantage: Full swing ± Restorer adds capacitance, takes away PDN current at X atio problem 6 ± Ratio problem EE115C
Restorer Sizing 3.0 de x [V] W/L n = 0.5 μ m / 0.25 μ m 2.0 W / L r =1.50/0.25 W / L r =1.75/0.25 age at no d 1.0 W / L r =1.0/0.25 W / L r =1.25/0.25 Volt a 0 100 200 300 400 500 0.0 Time [ps] ± Upper limit on restorer size ass ansistor PDN can have several transistors in stack 7 ± Pass-transistor PDN can have several transistors in stack EE115C

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.

## This note was uploaded on 04/18/2010 for the course EE 115C taught by Professor N/a during the Spring '10 term at UCLA.

### Page1 / 13

11a Pass Transistor Logic - EE115C Digital Electronic...

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

View Full Document
Ask a homework question - tutors are online