Power Reduction in High Speed Flash Analog-to-Digital Converters using Distortion Correction

May 25, 2007
Time: 2:00pm-3:00pm
Hosted by: Columbia Integrated System Laboratory
Speaker: Shanthi Pavan, Indian Institute of Technology-Madras


We present a flash ADC design technique that compensates for static nonlinearity of the up-front sample and hold circuit, so that high speed and high linearity can be obtained at the same time. This enables the use of a significantly larger input signal swing than would otherwise be possible, translating eventually into reduced power dissipation. The proposed technique functions in synergy with a new background comparator offset correction scheme. We demonstrate the efficacy of our techniques with measurement results from a 160 Msps 6-bit flash converter designed in a 0.35-$\mu\rm{m}$ CMOS process. The ADC consumes 50~mW from a 3.3~V power supply and has an ENOB of 5.3 bits at Nyquist.

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