Frequency synthesizer circuit comprising a phase locked loop

Details Frequency synthesizer circuit comprising a phase locked loop Frequency synthesizer circuit comprising a phase locked loop

2011-03-22

2011-03-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synthesizer

C327S150000, C327S159000

Reexamination Certificate

active

07911241

ABSTRACT:
A frequency synthesizer circuit that reduces undesired spurious sidebands while maintaining phase noise performance having a phase locked loop circuit comprising at least a phase detector, a controlled oscillator, a frequency divider coupled to the controlled oscillator for adjusting a frequency division of the frequency divider in response to a received control signal generated from a divisor value, a dithering circuit for providing a dither signal, and a sigma-delta modulator comprising an input for receiving a multi-bit input signal indicative of at least part of the divisor value. The input of the sigma-delta modulator is coupled with the dithering circuit for receiving the dither signal as a most significant bit of the multi-bit input signal.

REFERENCES:
patent: 5986512 (1999-11-01), Eriksson
patent: 6044124 (2000-03-01), Monahan et al.
patent: 6823033 (2004-11-01), Fahim
patent: 6985551 (2006-01-01), Mattisson et al.
patent: 7394418 (2008-07-01), Eikenbroek
patent: 2009/0212835 (2009-08-01), Xu et al.

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