Analog to digital converter having a high speed subtraction circ

Details Analog to digital converter having a high speed subtraction circ Analog to digital converter having a high speed subtraction circ

1976-06-10

1978-11-07

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

041248449

ABSTRACT:
An analog to digital converter for converting an analog input voltage into a four most significant bit group and a four least significant bit group of digital outputs at a first and a second group of output terminals. The complete analog to digital converter includes a first analog to digital converter for converting the analog input voltage into a four most significant bit group of digital outputs at the first group of output terminals. A digital to analog converter which is coupled to the first group of output terminals converts the four most significant bit group of digital outputs into a first analog current which is proportional to the magnitude of the four most significant bit group of digital outputs and into a second analog current such that the sum of the first and the second analog currents is a constant. An analog subtraction means which is responsive to the analog input voltage and to the first and second analog currents generates an analog output voltage having a magnitude representative of the four least significant bit group of digital outputs. A second analog to digital converter which is coupled to the analog subtraction circuit converts the analog output voltage into the four least significant bit group of digital outputs at the second output terminal means.

REFERENCES:
patent: 3721975 (1973-03-01), Brinkman
patent: 3789389 (1974-01-01), Lenhoff

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