Adaptable digital delta-sigma modulator for multiband frequency synthesizer

Author

Song, Yu ; Moule, Eric C. ; Ignjatovic, Zeljko

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Rochester, Rochester, NY

fYear

2008

fDate

10-13 Aug. 2008

Firstpage

842

Lastpage

845

Abstract

In this paper, we propose an adaptable-order single-loop digital DeltaSigma modulator which offers flexible noise shaping performance to maximize hardware sharing and power efficiency in multi-band frequency synthesizer applications. The proposed architecture utilizes feedback coefficients that allow computationally efficient digital implementation and also yield good noise shaping. Fixed-magnitude quantizer dithering is employed to eliminate idle channel tones and also to suppress in-band noise more efficiently than input dithering structures. MATLAB simulation was carried out. Finally, the proposed architecture was implemented and verified in an FPGA device.

Keywords

adaptive modulation; delta-sigma modulation; frequency synthesizers; interference suppression; adaptable digital delta-sigma modulator; channel tones; feedback coefficients; fixed-magnitude quantizer; flexible noise shaping performance; in-band noise suppression; multiband frequency synthesizer; noise shaping; power efficiency; Computer architecture; Delta modulation; Delta-sigma modulation; Digital modulation; Feedback; Frequency synthesizers; Hardware; MATLAB; Multi-stage noise shaping; Noise shaping;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. MWSCAS 2008. 51st Midwest Symposium on

Conference_Location

Knoxville, TN

ISSN

1548-3746

Print_ISBN

978-1-4244-2166-4

Electronic_ISBN

1548-3746

Type

conf

DOI

10.1109/MWSCAS.2008.4616931

Filename

4616931