Fractional-N frequency synthesizer with sigma-delta...

Details Fractional-N frequency synthesizer with sigma-delta... Fractional-N frequency synthesizer with sigma-delta...

2007-03-06

2007-03-06

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000

Reexamination Certificate

active

11383758

ABSTRACT:
A frequency synthesizer includes: a phase detector, a loop filter, a controllable oscillator, a frequency divider, and a sigma-delta modulator for providing the division factor according to an integral part and a fractional part. The sigma-delta modulator includes a controller for providing a first digital value, a second digital value and a third digital value; a first adder for combining the second digital value, the third digital value, and a digital feedback value to generate a combination result; a quantizer for quantizing the combination result to generate a quantization value; a second adder for combining the first digital value and the quantization value to generate the division factor; and a multiplier for multiplying the quantization value by a constant multiplication factor; wherein the controller adjusts the third digital value in response to the reference signal for making an output frequency resolution substantially fixed.

REFERENCES:
patent: 4965531 (1990-10-01), Riley
patent: 5079521 (1992-01-01), Gaskell et al.
patent: 6844836 (2005-01-01), Lee
patent: 6897796 (2005-05-01), Dias et al.
patent: 6927716 (2005-08-01), Keaveney et al.
patent: 7123101 (2006-10-01), Puma et al.

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