U.S. Philips Corporation

Robert Emile Van De Grift

Abraham Hoogendoorn

Theodorus J Van Kessel

An analog-digital converter in which a capacitor is charged or discharged by a reference current with the aid of transistor switches, a continuous current flows through the capacitor which is determined by an input difference voltage. One side of the capacitor is connected via a comparator to a flip-flop, to which flip-flop a clock signal is applied and which flip-flop drives the transistor switches. The other side of the capacitor is connected to the first input of a differential amplifier, which differential amplifier forms part of a negative feedback loop which maintains the voltage at the first input of the differential amplifier equal to the voltage which is applied to the second input of the differential amplifier.

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Eindhoven, Netherlands

Robert Emile Van De Grift