Dynamic vertical height control circuit

Details Dynamic vertical height control circuit Dynamic vertical height control circuit

1988-08-08

1990-07-31

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2970

Patent

active

049452924

ABSTRACT:
The present invention provides a novel dynamic vertical height control circuit for a CRT display which is adapted to receive an input signal over a broad range of variable frequencies. The dynamic variable input frequency is applied to a free running oscillator which is coupled to a ramp generator for producing a ramp output signal. The ramp output signal is coupled back through novel feedback means comprising a comparator and means for determining the magnitude of the ramp output signal voltage for producing a feedback signal which is applied as a control signal to the ramp generator. The feedback control maintains a vertical height control signal which maintains a constant vertical display size on the CRT display.

REFERENCES:
patent: 4682087 (1987-07-01), Kikuchi
patent: 4746842 (1988-05-01), Ponte et al.

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