Delay circuits matching delays of synchronous circuits

Details Delay circuits matching delays of synchronous circuits Delay circuits matching delays of synchronous circuits

2011-05-10

2011-05-10

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S261000

Reexamination Certificate

active

07940100

ABSTRACT:
Delay circuits capable of providing delays closely matching propagation delays of synchronous circuits are described. In one design, an apparatus includes a synchronous circuit and a delay circuit. The synchronous circuit includes a forward path from a data input to a data output. The synchronous circuit receives input data and provides output data with a propagation delay. The delay circuit receives an input signal and provides a delayed input signal having a delay matching the propagation delay of the synchronous circuit. The delay circuit includes at least two logic gates in the forward path of the synchronous circuit. The synchronous and delay circuits may be implemented based on the same or similar circuit architecture. The delay circuit may be based on a replica of the synchronous circuit, with the replica having feedback loops broken and clock input coupled to appropriate logic value to always enable the delay circuit.

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“International Search Report and Written Opinion—PCT/US2008/077404, International Search Authority—European Patent Office—Mar. 3, 2009”.

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