Precision integrating analog-to-digital converter system

Details Precision integrating analog-to-digital converter system Precision integrating analog-to-digital converter system

1984-10-04

1986-07-01

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

307257, 324 99D, 340347AD, 340347M, H03K 1320

Patent

active

045982708

ABSTRACT:
An analog-to-digital conversion system of the incremental pulse-width modulation type for generating a digital representation of the amplitude of an input analog current to be converted comprising a current integrator, a precision unipolar current source, means for switching current from that source in opposite directions to and from a current summing terminal at the input to the integrator, a timing source, and pulse-width control circuit which controls the means for switching current and which controls a clock signal gating circuit on and off to obtain the output digital representation. The pulse width control circuit utilizes a level shifter which shifts the level of a periodic sawtooth wave of period corresponding to the sampling interval by an amount proportional to the input analog current thereby generating a level-shifted sawtooth wave which is compared with the current integrator's output voltage to control the pulse width of a control signal used to control the means for switching and the clock signal gating circuit to generate the output digital representation.

REFERENCES:
patent: 3500109 (1970-03-01), Sugiyama et al.
patent: 3918050 (1975-11-01), Dorsman
patent: 4112428 (1978-09-01), Dorsman

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