Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1998-10-29
2000-09-12
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
330257, H03M 166
Patent
active
061183954
ABSTRACT:
An operational amplifier with an offset compensation function and a D/A converter employing the same for eliminating an offset voltage above a certain limit. In the operational amplifier, a current mirror is provided between a high voltage line and first and second nodes, and a current sink is provided between a third node and a low voltage line. A first transistor controls a current amount flowing from the first node to the third node, and a second transistor controls a current amount flowing the second node to the third node. An amplifier is connected between the second node and an output line to amplify a voltage signal of the output line. A mirror controller responds to the voltage signal from the output line to control the second transistor, and a sink controller responds to the voltage signal from the output line to control the current sink.
REFERENCES:
patent: 4007427 (1977-02-01), Leidich
patent: 4410857 (1983-10-01), Olmstead
patent: 4498001 (1985-02-01), Smoot
patent: 4605907 (1986-08-01), Rosenthal et al.
patent: 4992756 (1991-02-01), Anderson
patent: 5182525 (1993-01-01), Theus
patent: 5245344 (1993-09-01), Sooch
LG Electronics Inc.
Williams Howard L.
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