11a Pass Transistor Logic

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

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EE115C igital Electronic Circuits Digital Electronic Circuits Lecture 11a: Pass Transistor Logic
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Example: AND Gate ABF B 000 010 B A 1 0 0 111 F = AB 0 EE115C 2
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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
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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
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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
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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
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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
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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.

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

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