EEL6323-S10-HLec016-Circuit-Families-4spp

Yh f inputs yl f 3 example andnand given ah al bh bl

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Y_h f inputs Y_l f
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3 Example: AND/NAND Given A_h, A_l, B_h, B_l Compute Y_h = A * B, Y_l = ~(A * B) Pulldown networks are conduction complements Y_h Y_l A_h B_h B_l A_l = A*B = A*B Leakage Dynamic node floats high during evaluation – Transistors are leaky (I OFF 0) – Dynamic value will leak away over time – Formerly miliseconds, now nanoseconds! Use keeper to hold dynamic node – Must be weak enough not to fight evaluation CLK V Out Precharge Evaluate C L Clk Clk Out A M p M e Leakage Keepers are typically 1/10 of pull-down network Large keeper provides high noise immunity, but slower pull- down…contention (fights) pull down path In wide fan-in OR gates and multiplexers keepers must be stronger due to high leakage Use keeper smaller than minimum sized transistor in small dynamic gates Conditional Keepers
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4 Noise Sensitivity Dynamic gates are very sensitive to noise – floating (high- impedance) output susceptible noise Noise sources – Capacitive crosstalk – Charge sharing – Power supply noise – Feedthrough noise – And more!
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