Two-step parallel A/D converter

Details Two-step parallel A/D converter Two-step parallel A/D converter

1997-04-11

1998-11-24

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 136

Patent

active

058413898

ABSTRACT:
Provided is a two-step parallel A/D converter capable of operating at a higher speed than in the prior art and easily performing correction of upper bit data. An upper limit voltage V.sub.H of a voltage range for lower bit conversion is amplified on the basis of a median voltage V.sub.M of the voltage range by a second differential amplifier, and the amplified voltage is set to a high level reference voltage SUB.sub.H for lower bit conversion. A lower limit voltage V.sub.L of the voltage range is amplified on the basis of the median voltage V.sub.M by a third differential amplifier, and the amplified voltage is set to a low level reference voltage SUB.sub.L for lower bit conversion. A voltage V.sub.IN of an input analog signal is amplified on the basis of the voltage V.sub.M by a first differential amplifier, and lower bit data is obtained from a position between the voltage SUB.sub.H and the voltage SUB.sub.L which is occupied by an obtained voltage SUB.sub.IN. The voltages SUB.sub.H and SUB.sub.L are not changed by the voltage V.sub.IN of the input analog signal. Consequently, a settling time can be shortened more than in the prior art.

REFERENCES:
patent: 5019420 (1991-05-01), Matsuzawa et al.
A. Matsuzawa et al., "10-bit Bi-CMOS A/D Converter An813OK for Hi-Vision", National Technical Report, vol. 36, No. 4, Aug. 1990, pp. 383-392.

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