lecture15 - ECE520 VLSI Design Lecture 15: Dynamic Logic...

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1 ECE520 – Lecture 15 Slide: 1 University of New Mexico Office: ECE Bldg. 230B Office hours: Tuesday 2:00-3:00PM or by appointment E-mail: [email protected] Payman Zarkesh-Ha ECE520 – VLSI Design Lecture 15: Dynamic Logic ECE520 – Lecture 15 Slide: 2 University of New Mexico Review of Last Lecture Other Types of Static Logic Pseudo logic Pass-transistor logic
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2 ECE520 – Lecture 15 Slide: 3 University of New Mexico Today’s Lecture Dynamic Logic Advantages of dynamic logic Problems of dynamic logic Fixes to problems in dynamic logic ECE520 – Lecture 15 Slide: 4 University of New Mexico Issues with High Fan-in Static Logic Large number of devices (2x“fan-in”), which results in large C L Large series stacks, which results in weak drive strength Wide devices, which results if large diffusion capacitance Large input capacitance, which is load to previous stage Large delay mostly due to large load capacitance Example1: Static NAND3 Example2: Static NOR3
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3 ECE520 – Lecture 15 Slide: 5 University of New Mexico Introducing Dynamic Logic Fewer transistors (“fan-in”+2) since only PDN must be implemented PDN is comprised of NMOS, which is faster than PMOS t PHL is essentially zero since the output is precharged Lower input capacitance since only NMOS is driven
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This note was uploaded on 01/11/2011 for the course ECE 520 taught by Professor Zarkesh-ha,p during the Fall '08 term at New Mexico.

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lecture15 - ECE520 VLSI Design Lecture 15: Dynamic Logic...

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