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1.2-V, 10-bit, 60-360 MS/s time-interleaved pipelined analog-to-digital converter in 0.18 μm CMOS with minimised supply headroom

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3 Author(s)
S. -w. Sin ; Analog and Mixed Signal VLSI Laboratory, Faculty of Science and Technology, University of Macau, Macao, People's Republic of China ; Seng-pan U. ; R. P. Martins

A low-voltage 1.2-V, 10-bit, 60-360 MS/s six channels time-interleaved reset-opamp pipelined ADC is designed and implemented in a 0.18-μm CMOS (V THN/V THP = 0.63=V/-0.65 V for mid-supply floating switches). Without using on-chip high-voltage and low-V T options, the proposed ADC employs low-voltage resistive-demultiplexing techniques, low-voltage gain-and-offset compensation, feedback current biasing to reduce the sensitivity of the bias current over process variations and current-mode sub-ADCs with static current sharing for a low-voltage time-interleaved implementation. Speed options of 60-360 MS/s are available with scalable power and they can be obtained by automatic selection of the number of time-interleaved channels. The chip measurement results show that the ADC exhibits a differential non-linearity (DNL)/integral non-linearity (INL) better than 0.9/1.2 LSB and a peak SNDR above 54 dB, for all speed options, while consuming 85 mW at 60 MS/s and 426 mW at 360 MS/s. The active die area is 13.2 mm2.

Published in:

IET Circuits, Devices & Systems  (Volume:4 ,  Issue: 1 )