Frequency controller for a monolithic clock generator and...

Details Frequency controller for a monolithic clock generator and... Frequency controller for a monolithic clock generator and...

2005-09-20

2008-11-25

Mis, David (Department: 2817)

Oscillators

Frequency stabilization

Temperature or current responsive means in circuit

C331S17700V, C331S179000

Reexamination Certificate

active

07456699

ABSTRACT:
In various embodiments, the invention provides a frequency controller to control and provide a stable resonant frequency of a clock generator and/or a timing and frequency reference. Such stability is provided over variations in a selected parameter such as temperature and fabrication process variations. The various apparatus embodiments include a sensor adapted to provide a signal in response to at least one parameter of a plurality of parameters; and a frequency controller adapted to modify the resonant frequency in response to the second signal. In exemplary embodiments, the sensor is implemented as a current source responsive to temperature fluctuations, and the frequency controller is implemented as a plurality of controlled reactance modules which are selectively couplable to the resonator or to one or more control voltages. The controlled reactance modules may include fixed or variable capacitances or inductances, and may be binary weighted. Arrays of resistive modules are also provided, to generate one or more control voltages.

REFERENCES:
patent: 4978930 (1990-12-01), Suter
patent: 6225871 (2001-05-01), Chien
patent: 7098748 (2006-08-01), Schmidt
patent: 7227423 (2007-06-01), McCorquodale et al.

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