Reconfigurable CT QDSM with mismatch shaping dedicated to multi-mode low-IF receivers
Publish place: International Journal of Industrial Electronics, Control and Optimization، Vol: 2، Issue: 3
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IECO-2-3_010
تاریخ نمایه سازی: 20 تیر 1401
Abstract:
A reconfigurable third-order multi-bit continuous-time quadrature delta-sigma modulator (CT-QDSM) with mismatch error correction is reported in this paper. This modulator is designed for a tri-mode WLAN/WCDMA/GSM Low-IF (Intermediate Frequency) receiver. A three-bit quantizer is utilized to achieve the bandwidth (BW) and signal to noise ratio (SNR) required in WLAN/WCDMA standards. In this modulator, the adders are eliminated to optimize the power consumption. The excess loop delay of modulator compensated by half of the sampling period of quantizer. The reconfigurable dynamic element matching (DEM) is proposed to eliminate the mismatch error. Therefore, the I and Q mismatch error are alleviated by designing the data weighted average (DWA) and homogeneous block (HB) circuits for WCDMA/WLAN modes respectively. In addition, the complex_digital to analog converter (C_DAC) is designed to eliminate the mismatch between I and Q paths. Implemented in ۱۸۰ nm CMOS, achieves ۵۳.۶/۷۴.۲/۸۱.۶۳ dB SNR and figure-of-merits (FoM) of ۰.۸۶۳/۰.۴۹۵/۱.۶۳ pJ/ (conversion step) with a ۲۰/۲/۰.۲ MHz BW for WLAN/WCDMA/GSM operational mode.
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Authors
alireza shamsi
Department of Electrical Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Iran