Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2008-07-22
2008-07-22
Lam, Tuan T (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S161000, C327S244000, C327S245000
Reexamination Certificate
active
11951217
ABSTRACT:
A circuit apparatus and method for generating multiphase clocks in a delay lock loop (DLL) at sub-picosecond granularity. The circuit and method of the invention involves locking a number of cycles M in an N stage DLL, e.g., M cycles, where M is an prime number, which results in clock edges in each cycle that are not located at the same phase locations in each of the M cycles. Any of the phase locations from any of the cycles can be used to generate a clock edge for all cycle in the system application. This requires a special technique to “lock” the DLL loop over a M cycle period instead of a one cycle period. The benefit is that it improves the clock placement granularity by a factor of M over the previous art.
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Malladi Anjali R.
Ro Christopher
Wyatt Stephen D.
Harding W. Riyon
International Business Machines - Corporation
Lam Tuan T
Scully , Scott, Murphy & Presser, P.C.
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