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Analysis of blocking dynamic circuits

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3 Author(s)
Thorp, T. ; Matrix Semicond., Santa Clara, CA, USA ; Liu, D. ; Trivedi, P.

In order for dynamic circuits to operate correctly, their inputs must be monotonically rising during evaluation. Blocking dynamic circuits satisfy this constraint by delaying evaluation until all inputs have been properly setup relative to the evaluation clock. By viewing dynamic gates as latches, we demonstrate that the optimal delay of a blocking dynamic gate may occur when the setup time is negative. With blocking dynamic circuits, cascading low-skew dynamic gates allows each dynamic gate to tolerate a degraded input level. The larger noise margin provides greater flexibility with the delay versus noise margin tradeoff (i.e., the circuit robustness versus speed tradeoff). This paper generalizes blocking dynamic circuits and provides a systematic approach for assigning clock phases, given delay and noise margin constraints. Using this framework, one can analyze any logic network consisting of blocking dynamic circuits.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:11 ,  Issue: 4 )

Date of Publication:

Aug. 2003

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