DocumentCode
1986681
Title
Sigma-Delta Modulator with Feedback Dithering for RF Fractional-N Frequency Synthesizer
Author
Liu, Junhua ; Liao, Huailin ; Huang, Ru ; Zhang, Xing
Author_Institution
Institute of Microelectronics, Peking University, Beijing. E-mail: liujh@ime.pku.edu.cn
fYear
2005
fDate
19-21 Dec. 2005
Firstpage
137
Lastpage
139
Abstract
A new sigma-delta modulator structure with feedback dither is proposed in this paper, which is simplified by full reusing the self-generating signal of conventional SDM, the filter reshapes this output signal, and feeds back into the conventional SDM as dithering. The validity of the elimination of idle tones with full input range is verified with an eight-bit digital MASH 1-1-1, by both simulation and ASIC implementation. And the circuit exhibits high potential for high frequency, low-power monolithic CMOS fractional-N frequency synthesizer.
Keywords
Circuits; Delta-sigma modulation; Feedback; Filters; Frequency synthesizers; Low-frequency noise; Multi-stage noise shaping; RF signals; Radio frequency; Signal generators;
fLanguage
English
Publisher
ieee
Conference_Titel
Electron Devices and Solid-State Circuits, 2005 IEEE Conference on
Print_ISBN
0-7803-9339-2
Type
conf
DOI
10.1109/EDSSC.2005.1635225
Filename
1635225
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