Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-07-01
1992-07-14
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358220, G09G 104, H01J 2952, H04N 530
Patent
active
051306158
ABSTRACT:
A source of switched supply voltage is applied to a potential divider and coupled to an output terminal via a capacitor. An output tap of the potential divider is coupled to the output terminal via the conduction path of a grounded base transistor. In operation the transistor (1) operates in an inverted mode for initially charging the capacitor, (2) operates in either a normal or an inverted mode for regulating a grid bias voltage at said output terminal for grid current flow of either direction relative to the output terminal and (3) operates in an isolation mode upon removal of the switched supply voltage whereby the capacitor applies a negative grid cut-off bias to the output terminal, said transistor in said isolation mode preventing discharge of the capacitor thereby providing a grid cut-off bias at said output terminal having an extended cut-off time constant due to the lack of any discharge path for the capacitor other than leakage.
REFERENCES:
patent: 3946275 (1976-03-01), Marino
patent: 4056758 (1977-11-01), Schaas
patent: 4340910 (1982-07-01), Valdez
patent: 4488181 (1984-12-01), Haferl
patent: 5036257 (1991-07-01), Norman et al.
patent: 5043639 (1991-08-01), Gurley et al.
Coalter Richard G.
Emanuel Peter M.
Issing Gregory C.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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