Ultra high speed, low power, flash A/D converter utilizing a cur

Details Ultra high speed, low power, flash A/D converter utilizing a cur Ultra high speed, low power, flash A/D converter utilizing a cur

1997-09-30

2000-03-14

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 136

Patent

active

060378905

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.

REFERENCES:
patent: 3721975 (1973-03-01), Brinkman et al.
patent: 5283582 (1994-02-01), Krenik
patent: 5579006 (1996-11-01), Hasegawa et al.
IEEE Journal of Solid-State Circuits, vol. 29, No. 8, Aug. 1994--Hooman Reyhani and Philip Quinlan entitled "A5V,6-b,80 Ms/s BiCMOS Flash ADC".
Electronics Letters 11th May 1989 vol. 25 No. 10, p. 675-676, entitled "CMOS Variable Transconductance Circuit With Constant Bandwitdth."
ISSCC95/Session 5/Disk and Arithmetic Signal Processors/Paper WP 5.4--Masanori Izumikawa, Hlroyuki Igura, Kolchiro Furuta, Hiroshi Ito, Hitoshi Wakabayashi, Ken Nakajima, Tohru Mogami, Tadahiko Horluchl, Masakazu Yamashina--entitled "WP 5.4: A 0.9V 100MHz 4mW 2mm.sup.2 16b DSP Core"--NEC Corporation, Kanagawa, Japan.

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