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Title: A 10MHz BW 78dB DR CT ΣΔ modulator with novel switched high linearity VCO-based quantizer
Authors: He, Tao (何濤)
Jiang, Yang
Du, Yun (杜蘊)
Sin, Sai Weng (冼世榮)
U, Seng Pan (余成斌)
Martins, Rui Paulo Da Silva (馬許願)
Issue Date: May-2012
Publisher: IEEE
Citation: 2012 IEEE International Symposium on Circuits and Systems (ISCAS), May 2012, p. 65-69
Abstract: A novel structure of VCO-based quantizer for CT ΣΔmodulator is presented which can significantly improve theVCO linearity. Compared to the traditional methods, theproposed structure uses only one VCO in the system and it alsomaintains the intrinsic Dynamic Element Matching (DEM)function of the VCO-based quantizer. A first order CT ΣΔmodulator with the proposed quantizer is designed andsimulated in a 65nm CMOS process. The DAC of the ΣΔmodulator is optimized, which can also save half of the DACcells. The performance of the modulator can reach 69/67 dBSNR/SNDR and a dynamic range of 78 dB with a bandwidth of10MHz at 1V supply voltage.
Keywords: Analog-to-Digital converters

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