Transconductance and current modulation for resonant...

Details Transconductance and current modulation for resonant... Transconductance and current modulation for resonant...

2007-04-28

2009-06-09

Mis, David (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S17700V

Reexamination Certificate

active

07545231

ABSTRACT:
In various embodiments, the invention provides a frequency controller and a temperature compensator for frequency control and selection in a clock generator and/or a timing and frequency reference. 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: 5705957 (1998-01-01), Oka et al.
patent: 6154095 (2000-11-01), Shigemori et al.
patent: 7227424 (2007-06-01), McCorquodale et al.
patent: 2001/0041548 (2001-11-01), Bult et al.
patent: 2003/0030497 (2003-02-01), Duncan et al.

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