Subranging type A/D converter apparatus equipped with feedback l

Details Subranging type A/D converter apparatus equipped with feedback l Subranging type A/D converter apparatus equipped with feedback l

1996-10-28

1998-09-22

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341156, H03M 134

Patent

active

058120793

ABSTRACT:
In a subranging type A/D converter apparatus, the A/D converter apparatus executes A/D conversion by separating the A/D conversion into an A/D conversion of high-order bits and an A/D conversion of low-order bits in two steps, while feeding back a first control signal for executing the A/D conversion of the low-order bits according to results of the A/D conversion of the high-order bits. A digital logic circuit section executes decision of the A/D conversion to a control terminal of a switch group of a reference voltage generator circuit for generating a plurality of reference voltages via a feedback line provided in a plurality of voltage comparators provided with a plurality of differential amplifiers. Each of the differential amplifiers includes a plurality of transistors each for executing differential amplification. The plurality of differential amplifier transistors are arranged so as to be symmetrical with respect to the feedback line provided in each of the differential amplifiers.

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Masao Ito, Takahiro Miki, Shiro Hosotani, Toshio Kumamoto, Yukihiro Yamashita, Masaki Kijima and Keisuke Okada--"A 10b 20Ms/s 3V-Supply CMOS A/D Converter for Integration into System VLSLs"--International Solid-State Circuits Conference, San Franscisco, California, Feb. 16, 1994. *English Abstract only.

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