Memory retention function for an analogue memory device

Details Memory retention function for an analogue memory device Memory retention function for an analogue memory device

G - Physics

11

C

352/82.4

G11C 11/34 (2006.01) G11C 11/4074 (2006.01) G11C 27/02 (2006.01)

Patent

CA 1076701

Case 2521 ABSTRACT OF THE DISCLOSURE A circuit and a method for preventing the discharge of current from a charge storage device when a power failure occurs are disclosed. The charge storage device (e.g. capacitor) is effectively isolated from the rest of the circuitry by the use of electronic switches. These electronic switches are powered by an auxiliary power supply (independent of the main power supply) and are controlled by a voltage sensitive switch that turns the switches "off" as soon as the voltage magnitude of the main power supply drops below a predetermined minimum level. By so doing, the possible discharge paths for the charge storage devices (capacitors) are eliminated, and the capacitors retain the charge they had at the beginning of the power failure (except, of course, for any interval leakage).

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