Auto trimming oscillator

Details Auto trimming oscillator Auto trimming oscillator

2011-08-09

2011-08-09

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S025000

Reexamination Certificate

active

07994866

ABSTRACT:
An auto trimming oscillator includes a Successive Approximation Register (SAR), a frequency detector and an n-bit comparator. The SAR is used to iteratively trim the oscillator output clock frequency based on a difference between a reference clock frequency and the oscillator output clock frequency. The oscillator is trimmed to deliver a clock frequency which is a closest match to the reference clock frequency.

REFERENCES:
patent: 4272729 (1981-06-01), Riley, Jr.
patent: 4531102 (1985-07-01), Whitlock et al.
patent: 4855683 (1989-08-01), Troudet et al.
patent: 5696468 (1997-12-01), Nise
patent: 6242956 (2001-06-01), McCollough et al.
patent: 2003/0048139 (2003-03-01), Chien et al.
patent: 2007/0296509 (2007-12-01), Yang et al.

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