Method of and apparatus for signaling the end points of the ramp

Details Method of and apparatus for signaling the end points of the ramp Method of and apparatus for signaling the end points of the ramp

1981-06-10

1983-05-10

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347AD, H03K 1370

Patent

active

043832466

ABSTRACT:
In an integrated circuit type dual ramp analog to digital converter (10), the duration of the reference voltage integration, or ramp-down period, is precisely determined to control count accumulation in an external output counter (32a) operating in parallel with the standard internal counter of the integrated circuit. A reference voltage is stored on a flying capacitor (50) that is polarity switched, depending upon the polarity of the input signal, to be applied to the input of an integrator (12) during the ramp-down period. To establish the beginning and end of ramp-down, one end (52) of the flying capacitor (50) is applied to a comparator (54). As the voltage at the monitored end of the flying capacitor (50) undergoes abrupt level changes at the end points of the ramp-down interval, the comparator (54) generates start and stop pulses to the external output counter (32a).

REFERENCES:
patent: 3051939 (1962-08-01), Gilbert
patent: 3316547 (1967-04-01), Ammann
patent: 3749894 (1973-07-01), Avdeef
patent: 3750146 (1973-07-01), Lucas
patent: 3906486 (1975-09-01), Phillips
patent: 4057796 (1977-11-01), Hoogendoorn et al.
patent: 4074257 (1978-02-01), Henry
patent: 4217543 (1980-08-01), Strong
Watson "Electronics Industry" Dec. 1976 pp. 21-25.
Intersil Application Note-Mar. 23, 1981.

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