Analog-to-digital converting apparatus

Details Analog-to-digital converting apparatus Analog-to-digital converting apparatus

1980-09-22

1981-12-15

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 13175

Patent

active

043062245

ABSTRACT:
An analog-to-digital converting apparatus having a plurality of stages arranged in series, each stage including a comparator. The positive input terminals of all the comparators are connected in common to the analog signal input terminal. The negative input terminal of the first comparator in the series is connected to a reference voltage equal to the mid-point of the voltage range of the analog input signals. Each stage except the last has a resistance connected between the negative input terminal of its comparator and that of the next comparator in the series. Constant current sources, of equal value in each stage, are connected to each end of the resistance and through a current switch to a constant current sink. The current switch is conrolled by the output of the comparator of the stage so that a constant current flows through the resistance in one direction or the other, increasing or decreasing the voltage at the negative input terminal of the next comparator in the series. The values of resistances and constant currents are selected so that the voltage drop across the resistance of each stage is one-half that of the previous stage. The outputs of the comparators are periodically stored in latches, and the outputs of the latches provide a digital output signal corresponding to the amplitude of the analog input signal.

REFERENCES:
patent: 3100298 (1963-08-01), Fluhr
patent: 3585631 (1971-06-01), McCown
patent: 3858200 (1974-12-01), Henry
patent: 3968486 (1976-07-01), Gerdes
patent: 4099173 (1978-07-01), Zeskind
Trinko, "Electronic Design", vol. 17, No. 9, Apr. 26, 1969, pp. 74, 76.
Hartley, "Electronics", Feb. 5, 1976, pp. 92-93.
Mokhoff, "Electronics", May 10, 1979, pp. 105-116.

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