Switch control signal generator

Details Switch control signal generator Switch control signal generator

1998-08-07

2000-08-29

Ham, Seungsook

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, 315399, G09G 104, H01J 2970

Patent

active

061113719

ABSTRACT:
A scan frequency detector is responsive to a horizontal synchronization signal to generate a data signal that is indicative of the horizontal scan frequency. A digital-to-analog (D/A) converter produces from the data signal an analog, output signal at a first level, when the horizontal frequency is within a first range of values, at a second level, when the horizontal frequency is within a second range of values and at a third level, when the horizontal frequency is within a third range of values. A first switch of a switched S-capacitor arrangement, is turned on, when the output signal is at the first level. The first switch and a second switch of the switched S-capacitor arrangement, are turned on, when the output signal is at the second level. Both the first and second switches are turned off, when the output signal is at the third level. The third and second levels are distinguished by a level detector that includes a zener diode.

REFERENCES:
patent: 5250902 (1993-10-01), Williams et al.
patent: 5434484 (1995-07-01), Murakami
patent: 5714849 (1998-02-01), Lee
patent: 5929574 (1999-07-01), Kim et al.
patent: 6008749 (1999-12-01), Smith

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