Apparatus for detecting output load

Details Apparatus for detecting output load Apparatus for detecting output load

1996-08-22

1998-10-20

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

323317, H03M 166

Patent

active

058253211

ABSTRACT:
An apparatus for detecting when an output load of a digital-to-analog converter is changed to another value, automatically sensing the converted output load, and supplying a stable current to the output terminal of the digital-to-analog converter. Normally a digital-to-analog converter operated for processing a digital video signal, has two kinds of output loads, 75.OMEGA. and 37.5.OMEGA.. The apparatus detects whether the output load of the digital analog converter is 75.OMEGA. or 37.5.OMEGA., varies output current according to the detected output load, and therefore actively adjusts the video output voltage to be constantly in the range of 1V.sub.P--P.

REFERENCES:
patent: 4814688 (1989-03-01), Colles
patent: 5221890 (1993-06-01), Shyu et al.

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