Vertical deflection circuit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorOsamu Fujita
Life of this patent
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Abstract
A vertical deflection circuit having a vertical amplifier stage bias voltage stabilizing circuit including a differential amplifier circuit which operates only during the retrace period. One input of the differential amplifier circuit receives a D.C. bias voltage and the other input receives the mean voltage of an output signal. The output of the differential amplifier circuit is fed back to a drive stage to stabilize the bias voltage.
Claims10
A vertical deflection circuit comprising a saw-tooth wave voltage generator circuit, a drive stage coupled to the output terminal of said saw-tooth wave voltage generator circuit through an input coupling capacitor, a vertical amplifier stage directly coupled to said drive stage, and a vertical amplifier stage bias voltage stabilizing circuit including a differential amplifier circuit fed by a constant current source having a constant current circuit which operates only during a retrace period, a first input terminal of said differential amplifier circuit and a second input terminal of said differential amplifier circuit being connected to an output terminal of a circuit producing a mean voltage at the output terminal of said vertical amplifier stage, an first output terminal of said differential amplifier circuit being connected to the junction of said input coupling capacitor and the input terminal of said drive stage.
Dependencies are inferred from the claim text.