Integrated circuit analog-to-digital converter

Details Integrated circuit analog-to-digital converter Integrated circuit analog-to-digital converter

Filed on

1984-05-30

Date issued

1986-06-24

Examiner

Hix, L. T.

Patent Class

Communications: electrical

SubClass

Audible indication

SubSubClass

Percussion-type sound producer

Other Related Categories

307361, H03K 5153, H03M 112

Type

Patent

Status

active

Patent number

045969760

Description

ABSTRACT:
An analog-to-digital converter in the form of an integrated circuit providing a plurality of parallel-connected sub-converters, each producing one bit of the output word. For any sub-converter, an elongate P-type diffusion (20) serves as the base of a multiple-emitter NPN transistor. The same diffusion (20) serves as the collector of a pair of lateral PNP transistors. The lateral transistors inject current into the central diffusion, resulting in a parabolic voltage distribution along its length. A differential analog input voltage applied to the ends of the central diffusion shifts the parabolic voltage peak longitudinally along the diffusion. The multiple emitters of the NPN transistor are connected alternately to output nodes and sense the position of the parabolic voltage peak to produce the binary output.

REFERENCES:
patent: 3794892 (1974-02-01), Preston
patent: 4225854 (1980-09-01), Davis et al.
patent: 4270118 (1981-05-01), Brokaw
patent: 4475169 (1984-10-01), Gilbert

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