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2002 45th Midwest Symposium on Circuits and Systems. Conference Proceedings (Cat. No.02CH37378)

High-performance all-digital quadrature frequency synthesizer/mixer

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High-performance all-digital quadrature frequency synthesizer/mixer

Content Provider	IEEE Xplore Digital Library
Author	Zhangwen Tang Yang Wang Hao Min
Copyright Year	2002
Description	Author affiliation: Syst. State Key Lab., Fudan Univ., Shanghai, China (Zhangwen Tang; Yang Wang; Hao Min)
Abstract	In this paper, a high-performance all-digital quadrature frequency synthesizer/mixer applied to QAM modulation and demodulation is presented, which synthesizes 12-bit sine and cosine waveforms with a spectral purity of -83.0 dB. The synthesizer covers a bandwidth from DC to 100 MHz in steps of 0.0466 Hz with a corresponding switching speed of 5 ns at 200 MHz clock frequency. Also, it is capable of frequency, phase and quadrature amplitude modulation. In this design, an efficient ROM look-up table method for calculating the sine and cosine function is employed, and a compression algorithm that only calculates one-eighth sine function is adopted to reduce the volume of ROM. By taking advantage of sine and cosine symmetries, the size of the ROM look-up table is only 1/51 of that of traditional one. The resulting chip fabricated in 0 35 /spl mu/m five-level metal CMOS process has a complexity of about 20,000 gates with core area of 200 /spl times/ 100 mm/sup 2/.
Sponsorship	IEEE Circuits & Syst. Soc. School of Electr. & Comput. Eng. at Oklahoma State Univ
File Size	264434
File Format	PDF
ISBN	0780375238
DOI	10.1109/MWSCAS.2002.1187138
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-08-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency synthesizers Read only memory Quadrature amplitude modulation Table lookup Demodulation Bandwidth Clocks Algorithm design and analysis Compression algorithms CMOS process
Content Type	Text
Resource Type	Article

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