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A l0b 150 MSample/s 1.8V 123 mW CMOS A/D Converter  

Kim Se-Won (Dept. of Electronics Eng., Sogang University)
Park Jong-Bum (Dept. of Electronics Eng., Sogang University)
Lee Seung-Hoon (Dept. of Electronics Eng., Sogang University)
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Abstract
This work describes a l0b 150 MSample/s CMOS pipelined A/D converter (ADC) based on advanced bootsuapping techniques for higher input bandwidth than a sampling rate. The proposed ADC adopts a typical multi-step pipelined architecture, employs the merged-capacitor switching technique which improves sampling rate and resolution reducing by $50\%$ the number of unit capacitors used in the multiplying digital-to-analog converter. On-chip current and voltage references for high-speed driving capability of R & C loads and on-chip decimator circuits for high-speed testability are implemented with on-chip decoupling capacitors. The proposed AU is fabricated in a 0.18 um 1P6M CMOS technology. The measured differential and integral nonlinearities are within $-0.56{\~}+0.69$ LSB and $-1.50{\~}+0.68$ LSB, respectively. The prototype ADC shows the signal-to-noise-and-distortion ratio (SNDR) of 52 dB at 150 MSample/s. The active chip area is 2.2 mm2 (= 1.4 mm ${\times}$ 1.6 mm) and the chip consumes 123 mW at 150 MSample/s.
Keywords
A/S 변환기;ADC;파이프라인;CMOS;부트스트래핑;온칩 기준전압;
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