Digitally programmable apparatus for generating a substantially

Details Digitally programmable apparatus for generating a substantially Digitally programmable apparatus for generating a substantially

1978-12-22

1980-12-09

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 77CS, G01R 2316

Patent

active

042387272

ABSTRACT:
A digitally programmable ramp generator produces a substantially linear ramp along with an equivalent digital code by use of a multiplying digital to analog converter which drives an integrator which produces a ramp voltage. This ramp voltage is compared in a feedback circuit with a stairstep ramp (produced by another DAC driven by a counter) and the summed signal is coupled to the reference input of the multiplying DAC so that if there is a difference between the stairstep and the analog ramp the first converter will tend to catch up to the stairstep ramp. Such stairstep ramp is incremented by a comparator which senses when the reference voltage to the multiplying DAC approaches zero; each time this occurs there is an incrementing of the counter. Thus, the digital counter value is equivalent to the value of the analog ramp at any point in time.

REFERENCES:
patent: 3500183 (1970-03-01), McCutcheon
patent: 3729738 (1973-04-01), Cross et al.

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