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A sigma-delta(Σ△) DAC with channel filtering for multi-standard wireless transmitters used in the software-defined-radio(SDR) system is presented.The conversion frequency,transfer function of the digital filter and theΣ△modulator,word-length of the IDAC and cut-off frequency of the analog reconstruction filter can be digitally programmed to satisfy specifications of WCDMA,TD-SCDMA and GSM standards.TheΣ△DAC fabricated in SMIC 0.13-μm CMOS process occupies a die area of 0.72 mm~2,while consuming 5.52/4.82/3.04 mW in WCDMA/TD-SCDMA/GSM mode from a single 1.2-V supply voltage.The measured SFDR is 62.8/60.1/ 75.5 dB for WCDMA/TD-SCDMA/GSM mode,respectively.
A sigma-delta (ΣΔ) DAC with channel filtering for multi-standard wireless transmitters used in the software-defined-radio (SDR) system is presented. The conversion frequency, transfer function of the digital filter and the ΣΔ modulator, word- length of the IDAC and cut-off frequency of the analog reconstruction filter can be digitally programmed to satisfy the specifications of WCDMA, TD-SCDMA and GSM standards. Σ DAC fabricated in SMIC 0.13-μm CMOS process occupies a die area of 0.72 mm ~ 2, while consuming 5.52 / 4.82 / 3.04 mW in WCDMA / TD-SCDMA / GSM mode from a single 1.2-V supply voltage. The measured SFDR is 62.8 / 60.1 / 75.5 dB for WCDMA / TD- SCDMA / GSM mode, respectively.