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A Low-Power Capacitive Charge Pump Based Pipelined ADC

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3 Author(s)
Ahmed, I. ; Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada ; Mulder, J. ; Johns, D.A.

A low-power pipelined ADC topology is presented which uses capacitive charge pumps, source-followers, and digital calibration to eliminate the need for power-hungry opamps to achieve good linearity in a pipelined ADC. The differential charge pump technique achieves >10-bit linearity, and does not require an explicit common-mode-feedback circuit. The ADC was designed to operate at 50 MS/s in a 1.8 V, 0.18 ¿m CMOS process, where measured results show the peak SNDR and SFDR of the ADC to be 58.2 dB (9.4 ENOB), and 66 dB respectively. The ADC consumes 3.9 mW for all active circuitry and 6 mW for all clocking and digital circuits.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:45 ,  Issue: 5 )

Date of Publication:

May 2010

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