Voltage storage circuit useful in television receiver control ap

Details Voltage storage circuit useful in television receiver control ap Voltage storage circuit useful in television receiver control ap

1976-11-10

1977-12-27

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307230, 330 86, 328147, 328151, 358168, 358169, 307358, H03K 1722, H03K 1760

Patent

active

040656810

ABSTRACT:
A circuit for storing a DC voltage which may be used to control the volume, brightness, contrast, tint or color characteristics of a television receiver includes a semiconductor switching circuit for selectively coupling a DC voltage to a voltage storage capacitor through a DC impedance path. The DC impedance path is coupled between the inverting and noninverting inputs of an operational amplifier. The output of the operational amplifier is coupled to a utilization circuit to be controlled. A feedback path is coupled between the operational amplifier's output and inverting input to provide negative feedback so that a voltage balance is maintained between the inverting and noninverting inputs and thereby substantially eliminate leakage current flow to or from the storage capacitor through the DC impedance path.

REFERENCES:
patent: 3654560 (1972-04-01), Cath et al.
patent: 3700920 (1972-10-01), Eyler
patent: 3725682 (1973-04-01), Rubin et al.
patent: 3767939 (1973-10-01), Chamran et al.
patent: 3867702 (1975-02-01), Torpie et al.
patent: 4009402 (1977-02-01), Miller
Electronics, Feb. 1976, p. 112, "Video Detector Stores Peak for Minutes" by Hayes.

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