NDLI: A 400-MHZ 4th-order CT bandpass /spl Sigma//spl Delta/ modulator with automatic frequency tuning

Content Provider	IEEE Xplore Digital Library
Author	Wing Fai Loke Chin Fong Oh Yong Ping Xu
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore (Wing Fai Loke; Chin Fong Oh; Yong Ping Xu)
Abstract	This paper presents the design and implementation of a high-speed continuous-time (CT) bandpass sigma-delta modulator targeted for an intermediate frequency (IF) receiver with an IF of 400 MHz for GSM/WCDMA application. The loop filters in the modulator is implemented with Gm-C Opamp integrators in biquad configuration. An automatic frequency tuning circuit is employed to reduce the effects of process and temperature variations on the centre frequency. Based on a commercial 0.35-/spl mu/m SiGe BiCMOS process, the 4th-order bandpass modulator is able to obtain maximum SNRs of 77 dB and 62 dB for the signal bands of 200 kHz and 3.84 MHz, respectively, when sampled at 1.6 GHz.
Starting Page	24
Ending Page	27
File Size	678892
Page Count	4
File Format	PDF
ISBN	0780390059
DOI	10.1109/IWVDVT.2005.1504455
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-05-28
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	GSM Automatic frequency control Frequency modulation Circuit optimization Temperature Delta-sigma modulation Band pass filters Multiaccess communication Tuning Silicon germanium
Content Type	Text
Resource Type	Article

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