Frequency divider circuit

Details Frequency divider circuit Frequency divider circuit

2011-06-28

2011-06-28

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

C327S117000, C327S202000, C327S203000, C375S373000

Reexamination Certificate

active

07969209

ABSTRACT:
Fractional frequency division is performed by sequentially selecting phase signals for division, where transitioning from a previous phase signal to a next phase signal for division occurs in response to not only the frequency-divided previous phase signal but also a second one of the phase signals. A phase transition that is triggered at least in part in response to a second phase signal having a phase that is greater (with respect to the phase signal sequence) than the phase of the next phase signal can aid minimization of signal glitches. The first frequency-divided signal can be further divided to produce a second frequency-divided signal having a 50-percent duty cycle.

REFERENCES:
patent: 6570946 (2003-05-01), Homol et al.
patent: 6845490 (2005-01-01), Natsume
patent: 7035367 (2006-04-01), Melava
patent: 7405601 (2008-07-01), Garlapati et al.
patent: 7551009 (2009-06-01), Garlapati et al.
patent: 2001/0022537 (2001-09-01), Melava et al.
patent: 2003/0068003 (2003-04-01), Casagrande

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