Electronic system with high speed, low power, A/D converter

Details Electronic system with high speed, low power, A/D converter Electronic system with high speed, low power, A/D converter

1999-03-04

2000-09-19

Wamsley, Patrick

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 136

Patent

active

061219134

ABSTRACT:
A method and apparatus for performing analog to digital conversion. A voltage to current converter converts an analog input voltage to an input current. A current reference generates a reference current. A plurality of scaling elements scaled the reference current to yield a plurality of scaled reference currents each corresponding to some voltage level within the dynamic range of the input voltage. The input current is compared to each of the scaled reference currents in a plurality of current comparators to generate a thermometer code from which a digital representation of the analog input voltage is derived.

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Klumperink et al, "CMOS Variable Transconductance Circuit with Constant Bandwidth," Electronics Letters, 675-676, 1989.
Bracey et al, "A Switched Current Sigma-Delta Convertor [sic] for Direct Photodiode Signal Acquisition," University of Southampton, 1-5, 1994.
Huang et al, "Design of a CMOS Differential Difference Amplifier and Its Applications in A/D and D/A Converters," IEEE, 478-483, 1994.

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