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Clock skew optimization

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1 Author(s)
Fishburn, J.P. ; AT&T Bell Labs., Murray Hill, NJ, USA

Improving the performance of a synchronous digital system by adjusting the path delays of the clock signal from the central clock source to individual flip-flops is investigated. Using a model to detect clocking hazards, two linear programs are investigated: (1) minimizing the clock period, while avoiding clock hazards, and (2) for a given period, maximizing the minimum safety margin against clock hazard. These programs are solved for a simple example, and circuit simulation is used to contrast the operation of a resulting circuit with the conventionally clocked version. The method is extended to account for clock skew caused by relative variations in the drive capabilities of N-channel versus P-channel transistors in CMOS

Published in:

Computers, IEEE Transactions on  (Volume:39 ,  Issue: 7 )

Date of Publication:

Jul 1990

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