Information handling system with self-calibrating digital-to-analog converter
AssigneeDell Products L.P.
InventorsLawrence E. Knepper, Zheng Yuan
Life of this patent
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Abstract
A self-calibrating video circuit comprises a first and second digital-to-analog converter generating first and second output signals, and a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter.
Claims28
Information handling system with a self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- and
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter.
Information handling system with a self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter, the calibration circuit comprises a comparator for comparing the level of the first and second output signal and generating a calibration signal fed to the first digital-to-analog converter;
- and
- an analog-to-digital converter receiving the calibration signal and a calibration unit coupled with the output of the analog-to-digital converter and the first digital-to-analog converter.
Information handling system with a self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter, the calibration circuit comprises a comparator for comparing the level of the first and second output signal and generating a calibration signal fed to the first digital-to-analog converter, wherein the comparator comprises a first and second comparator for generating a positive or negative difference signal;
- and
- associated first and second analog-to-digital converters coupled with associated first and second registers for storing a positive or negative calibration value.
Method of operating an information handling system having a self-calibrating video circuit with a first and second digital-to-analog converter generating a first and second output signal, the method comprising the steps of:
- applying a digital white signal to the first and second digital-to-analog converter;
- determining the difference between a first and a second output signal;
- and
- calibrating the first digital-to-analog converter to match the output signal of the second digital-to-analog converter.
Method of operating an information handling system having a self-calibrating video circuit with a first and second digital-to-analog converter generating a first and second output signal, the method comprising the steps of:
- applying a digital white signal to the first and second digital-to-analog converter;
- determining the difference between a first and a second output signal;
- calibrating the first digital-to-analog converter to match the output signal of the second digital-to-analog converter;
- and
- storing the difference in a register.
Method of operating an information handling system having a self-calibrating video circuit with a first and second digital-to-analog converter generating a first and second output signal, the method comprising the steps of:
- applying a digital white signal to the first and second digital-to-analog converter;
- determining the difference between a first and a second output signal;
- and
- calibrating the first digital-to-analog converter to match the output signal of the second digital-to-analog converter;
- wherein the applying, determining, and calibrating steps are performed after a reset of the information handling system.
Method of operating an information handling system having a self-calibrating video circuit with a first and second digital-to-analog converter generating a first and second output signal, the method comprising the steps of:
- applying a digital white signal to the first and second digital-to-analog converter;
- determining the difference between a first and a second output signal;
- and
- calibrating the first digital-to-analog converter to match the output signal of the second digital-to-analog converter;
- wherein the applying, determining, and calibrating steps are performed after a manual trigger signal.
A self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- and
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter.
A self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter, the calibration circuit comprises a comparator for comparing the level of the first and second output signal and generating a calibration signal fed to the first digital-to-analog converter;
- and
- an analog-to-digital converter receiving the calibration signal and a calibration unit coupled with the output of the analog-to-digital converter and the first digital-to-analog converter.
A self-calibrating video circuit comprising:
- a first and second digital-to-analog converter generating first and second output signals;
- and
- a calibration circuit coupled with the first and second digital-to-analog converters for calibrating the first digital-to-analog converter output signal to the output signal of the second digital-to-analog converter, the calibration circuit comprises a comparator for comparing the level of the first and second output signal and generating a calibration signal fed to the first digital-to-analog converter, wherein the comparator comprises a first and second comparator for generating a positive or negative difference signal;
- and
- associated first and second analog-to-digital converters coupled with associated first and second registers for storing a positive or negative calibration value.
Dependencies are inferred from the claim text.