3 GHz, 150 mW, 4 bit GaAs Analogue to Digital Converter
- 1 October 1986
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Abstract
Using a conventional "flash" structure, a 4 bit GaAs analogue to digital (A/D) converter has been fabricated and measured successfully up to a clock frequency of 3 GHz. This result is the highest speed ever reported for 4 bit ADC's and could lead in the near future to a real break through in performances for future digital signal processing systems. The GaAs chip, fabricated with a N-OFF 1 µm recessed gate process and consuming a mere 150 mW seems to be one order of magnitude more promising than the fastest silicon converters ever reported (5 bit, 500 MHz (1) or 6 bit 200 MHz (2)). Enhancement-mode MESFET's arranged in an original fashion, made it possible to get simple single-clocked comparators, combining a high sensitivity, a large input range and a complete cancellation of low frequency parasitic effects. Moreover, low dislocation density material pulled at LEP, has enabled to reduce the standard deviation of the comparators offset voltage down to 15 mV, and to limit ADC's non-linearities to ± 1/4 LSB (typical).Keywords
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