Single-bit sigma-delta modulated fractional-N frequency...

Details Single-bit sigma-delta modulated fractional-N frequency... Single-bit sigma-delta modulated fractional-N frequency...

2005-01-18

2005-01-18

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C327S105000, C377S047000

Reexamination Certificate

active

06844836

ABSTRACT:
A fractional-N frequency synthesizer includes a voltage-controlled oscillator, a dual-modulus divider which divides an output frequency of the voltage-controlled oscillator according to a fractional control input, and a phase comparator which compares a phase of an output of the dual-modulus divider with a phase of a reference frequency, where an output of the phase comparator controls an input of the voltage-controlled oscillator. The synthesizer further includes a sigma-delta modulator which has a single-bit output, and a bit converter which converts the single-bit output of the sigma-delta modulator to the fractional control input applied to the dual-modulus divider.

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