Device for reading a quantity of electric charge

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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353165, 377 60, H03K 519, H03K 5153, G01R 1900, H03H 1500

Patent

active

043777600

ABSTRACT:
An analog device for reading a quantity of electric charge, for example, in a transversal charge transfer filter. The device includes a capacitor and two MOS transistors which are connected in series to the point in the filter where the charge is to be read. The capacitor is connected to the common point of the two transistors which are controlled in phase opposition to insure charging of the capacitor. The capacitor maintains a potential at the charge reading point constant. Any variation in the quantity of charge under an electrode is converted into a variation of potential at the common point and this forms the read signal which is detected by means of a third MOS transistor.

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Engeler et al., IEEE-JSSC, vol. SC-7, No. 5, pp. 330-335; 10/1972.
Mok et al., Solid-State Electronics, (Pub), 1974, vol. 17, No. 11, pp. 1147-1154.

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