Calibration device for a video input stage

Details Calibration device for a video input stage Calibration device for a video input stage

2006-08-15

2006-08-15

Hsia, Sherrie (Department: 2622)

Television

Image signal processing circuitry specific to television

Gray scale transformation

C348S572000, C348S691000

Reexamination Certificate

active

07092039

ABSTRACT:
A calibration device for a video circuit input stage comprises an analog-to-digital converter and an input capacitor constantly discharged by a power source and recharged by a charging circuit by means of a first and a second charging current. The charging circuit is controlled by a central processing unit receiving an estimate of the variation between the converter's output code and a clamp value.

REFERENCES:
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patent: 5731771 (1998-03-01), Chesneau
patent: 6049355 (2000-04-01), Kameyama
patent: 6118830 (2000-09-01), Thies et al.
patent: 6492921 (2002-12-01), Kunitani et al.
patent: 0 926 887 (1999-06-01), None
patent: 11-146229 (1999-05-01), None

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