Method of and apparatus for producing a digital indication of th

Details Method of and apparatus for producing a digital indication of th Method of and apparatus for producing a digital indication of th

1988-01-19

1989-04-11

Miska, Vit W.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341158, 341161, 250214DC, H03M 138

Patent

active

048210366

ABSTRACT:
A digital representation of the time-integral of the illumination-dependent electric current flowing in a photo-conductive diode (1) is produced by feeding the current initially to the first capacitor (3a) of a series of capacitors (3a-3d). When the voltage across this first capacitor reaches a predetermined value the current is subsequently directed to the next capacitor (3b) of the series, and so on for the remaining capacitors (3c, 3d) sequence succession, by means of a voltage level responsive coupling cirucit (6). At the end of the integration period the voltage level in that capacitor which is only partly charged at that time is converted into digital form by means of a corresponding analog-to-digital converter (16) and applied to an output (18) together with a code identifying from which capacitor the digital output has been derived. If the number of capacitors and also the capacitance of each capacitor relative to that of the previous one is suitably chosen, the arrangement can cope with a very large range of values of the integral of the input current. The capacitors together with the coupling means (6) may be replaced by a charge-coupled device structure comprising a series of charge wells, where each well can overflow into the next well of the series.

REFERENCES:
patent: 3958210 (1976-05-01), Levine
patent: 4072939 (1978-02-01), Heller et al.
patent: 4136335 (1979-01-01), Tompsett
patent: 4320390 (1982-03-01), Scott
patent: 4485372 (1984-11-01), Holloway

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