Output Prediction Logic: A High Performance CMOS Design ...

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Background (cont’d) • Dynamic circuits have notable disadvantages • Domino logic must be mapped to a unate network, which usually requires duplication of logic • Main disadvantage going forward: increased noise sensitivity (compared to static CMOS) • Increase noise margin: sacrifice performance gain • Elusive goal: retain the good attributes of static CMOS (high noise immunity and easy technology mapping) while obtaining greater speed
Why Static CMOS is So Slow • All gates are inherently inverting • On any circuit path, in the worst case: – Every output must fully transition from 1 to 0, or 0 to 1 • You must design for the worst case 1 1 gate1 gate2 gate3 gate4 0 0
Page 1 and 2: Output Prediction Logic: A High Per
Page 3: Background • Dynamic circuit fami
Page 7 and 8: Output Prediction Logic • Problem
Page 9 and 10: OPL Pseudo-nMOS Gate • Tri-state,
Page 11 and 12: OPL Clocking 1 1 1 1 gate1 gate2 ga
Page 13 and 14: OPL Clocking • When a clock arriv
Page 15 and 16: VDD GND clk in a. Early Clock out O
Page 17 and 18: 3 2.5 2 1.5 1 0.5 0 Waveforms for O
Page 19 and 20: Measuring Delays for OPL • For ea
Page 21 and 22: 10-Gate Critical Path Delays (FO of
Page 23 and 24: Energy Consumption Chain Type Stati
Page 25 and 26: Delays for Two Implementations a 32
Page 27 and 28: Delays for ISCAS Random Logic Bench
Page 29 and 30: Domino CVSL Gate Logic Inputs CLK C
Page 31 and 32: Delays (ns) for Chains of 10 Gates
Page 33 and 34: Long Wire With Noise Injection
Page 35 and 36: Delays of OPL-dyn. AOI22 Chains inc
Page 37 and 38: Gclk Clock Generation clk1 clk2 •
Page 39 and 40: Ultra High Speed Adder Design • U
Page 41 and 42: 8-Bit Sum using Carry Select Sum 7
Page 43 and 44: 64-bit Adder: Statistical Analysis
Page 45: OPL Summary • OPL appears to be f

Output Prediction Logic: A High Performance CMOS Design ...

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