Data signal controlled oscillator for a video display

Details Data signal controlled oscillator for a video display Data signal controlled oscillator for a video display

1992-03-02

1993-04-20

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, G09G 104, H01J 2970

Patent

active

052045897

ABSTRACT:
The free-running frequency of a bus controlled horizontal oscillator is adjusted by programming of a first data signal that is coupled to a digital-to-analog converter. The programming causes the first data signal to be non-alterable. The programming is done during manufacturing of a wafer that includes the oscillator. A second data signal that is coupled from a microprocessor via a bus and via a second analog-to-digital converter to the oscillator can vary the oscillator free-running frequency to provide for tolerance compensation. The first data signal is immune against data errors. The second data signal is not immune against data errors, but can vary the oscillator frequency within only a relatively narrow range of values. Consequently, data errors are prevented from causing a significant change in the oscillator free-running frequency that might have occurred had both data signals been alterable.

REFERENCES:
patent: 4463288 (1984-07-01), Judd
patent: 4803407 (1989-02-01), Mehrgardt
patent: 5124671 (1992-06-01), Srivastava
An article entitled A New Video Processor for Color TV in the names of Yamamoto et al, dated 1988 and publ. by IEEE.

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