Flash A/D converter

Details Flash A/D converter Flash A/D converter

1996-02-06

1997-11-04

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341135, H03M 136

Patent

active

056844867

ABSTRACT:
A flash A/D converter includes a plurality of master comparators for comparing a plurality of reference voltages and an input analog signal to absorb a current with a constant value from a non-inverted output or inverted output of each master comparator, a plurality of constant current sources, a plurality of load resistors and a plurality of slave comparators for outputting desired digital signals. The constant current value of one of the constant current sources coupled to a signal line coupled to the input of the slave comparator of a lower bit side is set to a value larger than that of one of the constant current sources coupled to a signal line coupled to the input of the slave comparator of a higher bit side. Thereby, it is possible to provide a flash A/D converter which has a low power consumption and a high speed.

REFERENCES:
patent: 4608555 (1986-08-01), Hoeft
patent: 5307067 (1994-04-01), Kimura et al.
Hiroshi Kimura, et al., "A 10b 300MHz Interpolated-Parallel A/D Converter", Technical Reports of IECIE, ICD92-19, pp. 1-8, 1992.
Hiroshi Kimura et al., "A 10b 300MHz Interpolated-Parallel A/D Converter", 1992 Symposium on VLSI Circuits Digest of Technical Papers, pp. 94-95.

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