Monolithic clock generator and timing/frequency reference

Details Monolithic clock generator and timing/frequency reference Monolithic clock generator and timing/frequency reference

2005-03-21

2010-02-02

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S1170FE

Reexamination Certificate

active

07656243

ABSTRACT:
In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes. The various apparatus embodiments include a resonator adapted to provide a first signal having a resonant frequency; an amplifier; a temperature compensator adapted to modify the resonant frequency in response to temperature; and a process variation compensator adapted to modify the resonant frequency in response to fabrication process variation. In addition, the various embodiments may also include a frequency divider adapted to divide the first signal having the resonant frequency into a plurality of second signals having a corresponding plurality of frequencies substantially equal to or lower than the resonant frequency; and a frequency selector adapted to provide an output signal from the plurality of second signals. The output signal may be provided in any of various forms, such as differential or single-ended, and substantially square-wave or sinusoidal.

REFERENCES:
patent: 6154095 (2000-11-01), Shigemori et al.
patent: 7227423 (2007-06-01), McCorquodale et al.
patent: 2001/0041548 (2001-11-01), Bult et al.
patent: 2003/0030497 (2003-02-01), Duncan et al.
patent: 2003/0058057 (2003-03-01), Schmidt

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