Title:
フラクショナルN周波数シンセサイザー用可変モジュラス変調器
Document Type and Number:
Japanese Patent JP5391363
Kind Code:
B2
Abstract:
A variable modulus sigma delta (SigmaDelta) modulator for a fractional-N frequency synthesizer in accordance with the present invention may include an integer division unit; a pulse-width modulation (PWM) generator, a SigmaDelta noise-shaping unit, a first input FRAC for receiving a first programmable integer, and a second input MOD for receiving a second input, wherein the integer division unit is configured to perform a translation from the first input and the second input into a first output FRAC' and a second output R, the PWM generator is configured to receive the second input MOD and the second output R, and generate a modulated pulse signal, and the SigmaDelta noise-shaping unit is configured to receive the first output and the modulated pulse signal, and generate a sequence whose average equals approximately the first input over the second input.
Inventors:
Cedric Moran
David Canard
David Canard
Application Number:
JP2013504604A
Publication Date:
January 15, 2014
Filing Date:
May 31, 2012
Export Citation:
Assignee:
Asahi Kasei Electronics Co., Ltd.
International Classes:
H03K7/08; H03M1/08; H03M3/02
Other References:
RILEY ET AL.,Delta-Sigma Modulation in Fractional-N Frequency Synthesis,IEEE J.OF SOLID-STATE CIRCUITS,米国,1993年 5月,vol. 28, no. 5,pages 553 - 559
PERROTT ET AL.,A 27-mW CMOS Fractional-N Synthesizer Using Digital Compensation for 2.5-Mb/s GFSK Modulation,IEEE J.OF SOLID-STATE CIRCUITS,米国,1997年12月,vol. 32, no. 12,pages 2048 - 2060
CHEN ET AL.,A 5.2GHz CMOS fractional-n frequency synthesizer with a MASH delta-sigma modulator,CIRCUITS AND SYSTEMS, 2008. MWSCAS 2008. 51ST MIDWEST SYMPOSIUM 2008,米国,2008年,pages 738 - 742
PERROTT ET AL.,A 27-mW CMOS Fractional-N Synthesizer Using Digital Compensation for 2.5-Mb/s GFSK Modulation,IEEE J.OF SOLID-STATE CIRCUITS,米国,1997年12月,vol. 32, no. 12,pages 2048 - 2060
CHEN ET AL.,A 5.2GHz CMOS fractional-n frequency synthesizer with a MASH delta-sigma modulator,CIRCUITS AND SYSTEMS, 2008. MWSCAS 2008. 51ST MIDWEST SYMPOSIUM 2008,米国,2008年,pages 738 - 742
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office