Sample pulse generator for automatic kinescope bias system

Details Sample pulse generator for automatic kinescope bias system Sample pulse generator for automatic kinescope bias system

1993-08-31

1995-04-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348379, H01J 2952

Patent

active

054102227

ABSTRACT:
Control circuitry, in an AKB sample pulse generator, enables charging of a capacitor upon initiation of a vertical retrace pulse, initiates discharge of the capacitor in response to termination of the retrace pulse and concurrently produces an AKB output pulse having a width (W) determined by an RC time constant and having a delay time (Td) relative to initiation of the retrace pulse that is equal to the length (L) of the retrace pulse and that is independent of the value of the RC time constant. Advantageously, the AKB sample pulse delay time tracks variations, if any, of the retrace pulse and is unaffected by parameter variations of the RC components. Additionally, the sample pulse width can be controlled with analog simplicity and can be increased, for the same amount of overscan as compared with systems in which both pulse delay and width exhibit component sensitive delay times, thereby providing improved AKB control accuracy due to the increased "aperture" or sampling time.

REFERENCES:
patent: 4263622 (1981-04-01), Hinn
patent: 4694350 (1987-09-01), Hinn

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