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A 10-bit 5-Msample/s CMOS two-step flash ADC

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3 Author(s)

A 10-b, 5Msample/s, two-step flash A/D converter fabricated in a 1.6 mu m CMOS process is described. The architecture is based on a resistor string and capacitor arrays and was developed to overcome the disadvantages of the previous approaches, namely flash, pipelined, and classical two-step converters. With minimal capacitor matching requirements and comparator offset voltage cancellation, the converter is monotonic. To minimize charge-injection errors the converter is fully differential. A high-speed comparator architecture using three comparator stages was designed to provide a gain of more than 1000, and a comparison time of less than 10 ns. The total area of the converter excluding the bonding pads is 54 kmil/sup 2/. Power dissipation is 350 mW, of which 60 mW is dissipated in the resistor string.<>

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:24 ,  Issue: 2 )

Date of Publication:

April 1989

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