High resolution digital loop circuit

Details High resolution digital loop circuit High resolution digital loop circuit

2006-11-07

2006-11-07

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S150000

Reexamination Certificate

active

07132867

ABSTRACT:
A digital feedback loop circuit achieves a resolution as good as the intrinsic resolution of the delay element of the circuit, notwithstanding the presence of a feedback counter/divider of integer value N that might otherwise be expected to multiply the minimum resolution by N. Output altering circuitry is used to alter the error feedback signal for M out of every N feedback cycles in such a way that the overall delay over N cycles can be controlled to within the resolution of the delay element. In one embodiment, the output altering circuitry includes a second counter whose maximum value is controllable and that outputs a signal whose value changes after its current maximum value has been reached. In another embodiment, the output altering circuitry includes a lookup table preloaded with sequences of output signals, with the sequence selected by a controller.

REFERENCES:
patent: 5812619 (1998-09-01), Runaldue
patent: 6348823 (2002-02-01), Pan
patent: 6449327 (2002-09-01), Rosen
patent: 6680874 (2004-01-01), Harrison
patent: 6711226 (2004-03-01), Williams et al.
patent: 6952124 (2005-10-01), Pham

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