lecture12 - Lecture 12: Low Power & Sequential Intro...

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Lecture 12: Low Power & Sequential Intro EECS 312 Reading: 7.1, 7.2.1
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Last Time • Dynamic logic noise properties – Charge leakage – Charge sharing – Clock feedthrough • 2nd order effects
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Lecture Overview • Types of dynamic logic: – Domino (very common) – np-CMOS • Using Vdd, Vth to reduce power • Sequential logic introduction – Concept of storing state – Latches vs. flip-flops
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Cascading Dynamic Gates V CLK CLK Out1 M p M e M p M e CLK CLK Out2 CLK In In Out1 Out2 V V Tn t Only 0 1 transitions allowed at inputs!
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Domino Logic: Very Popular Also called keeper M p M e V DD PDN φ In 1 In 2 In 3 Out1 φ M p M e V DD PDN φ In 4 φ Out2 M r V DD Static Inverter with Level Restorer
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Domino Logic - Characteristics • Only non-inverting logic • Very fast: only 1 Æ 0 transitions at input to inverter – We can move V M upwards by skewing W p /W n ratio of inverter • Adding a keeper/level restorer reduces leakage and charge sharing problems • The inverter can then be optimized to match the fan-out load
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Designing with Domino Logic M p M e V DD PDN φ In 1 In 2 In 3 Out1 φ M p M e V DD PDN φ In 4 φ Out2 M r V DD Inputs = 0 during precharge Can be eliminated!
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lecture12 - Lecture 12: Low Power & Sequential Intro...

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