Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Reexamination Certificate
2006-04-11
2006-04-11
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
C331S016000, C331S025000, C327S156000
Reexamination Certificate
active
07026878
ABSTRACT:
A frequency synthesizer that includes two fractional dividers, two noise-shaped quantizers, three integer dividers, a PLL, an algorithm embodied in control logic, and an adjustment means. The noise-shaped quantizers are used to quantize two fractional (fixed-point) values, derived from the divider control words, into time-varying values. The dividers and PLL are used to generate an output signal by means of multiplying a reference signal by the quotient of the divider control word values. Accordingly, the frequency synthesizer of the present invention can provide a very precise output clock, with the average output frequency being the input frequency multiplied by the quotient of the two divider control words, and with high jitter stability.
REFERENCES:
patent: 2004/0032898 (2004-02-01), Smith
patent: 2004/0036509 (2004-02-01), Smith
patent: 2004/0052324 (2004-03-01), Smith
patent: 2005/0046491 (2005-03-01), Smith
Mis David
MStar Semiconductor Inc.
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