Frequency synthesizer having variable frequency resolution,...

Details Frequency synthesizer having variable frequency resolution,... Frequency synthesizer having variable frequency resolution,...

2008-05-06

2008-05-06

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C327S157000, C341S143000

Reexamination Certificate

active

07369001

ABSTRACT:
A fractional-N frequency synthesizer supporting multi-band operation, having variable frequency resolution obtained by sigma-delta modulating a multi-bit frequency resolution control signal having at least one pulse, the at least one pulse having a period of P and a variable duty cycle. Frequency resolution can be increased by changing the duty cycle and without increasing input bits to the sigma-delta modulator. Thus, a core size of the sigma-delta modulator may be reduced.

REFERENCES:
patent: 5880642 (1999-03-01), Martinez
patent: 7012471 (2006-03-01), Lyden et al.
patent: 9148885 (1997-06-01), None
patent: 2001237709 (2001-08-01), None
patent: 2002-28418 (2002-04-01), None
patent: 1020040105443 (2004-12-01), None

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