Analog-to-digital current converter

Details Analog-to-digital current converter Analog-to-digital current converter

1983-05-27

1986-03-04

Smith, Jr., David

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

045742707

ABSTRACT:
An analog-to-digital current converter comprises n series-connected stages which each provide one bit of the Gray code. For this purpose each stage m derives a difference current from the input current (i.sub.i/m), which is the output current (i.sub.0/m-1) of the preceding stage, and a reference current (I/2.sup.m-1) from a source (6). This difference current flows to the output (a) of the stage m (i.sub.o/m) either via a diode (3) or via a current (11) depending on its direction. Conduction of the diode (3) or of the current-mirror circuit (11) is used for the bit indication.
This results in a very fast analog-to-digital converter with few components and a high accuracy and resolution.

REFERENCES:
patent: 4275386 (1981-06-01), Michel et al.
patent: 4295123 (1981-10-01), Reid
patent: 4306224 (1981-12-01), Geller et al.
patent: 4325054 (1982-04-01), van de Plassche
patent: 4379285 (1983-05-01), Dooley
patent: 4384274 (1983-05-01), Mao

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