Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2005-03-22
2005-03-22
Tan, Vibol (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S258000, C326S127000, C326S115000
Reexamination Certificate
active
06870423
ABSTRACT:
An output circuit has a data control circuit, a variable resistance circuit, a common-mode voltage detection circuit, an adjusting circuit. The data control circuit controls data included in an output signal according to an input signal, the variable resistance circuit is connected in series with the data control circuit between a first power supply line and a second power supply line. Further, the common-mode voltage detection circuit detects a common-mode voltage of the output signal, and the adjusting circuit adjusts a resistance of the variable resistance circuit according to an output of the common-mode voltage detection circuit. The common-mode voltage of the output signal is adjusted to equal an optional voltage, and an amplitude of the output signal is adjustable.
REFERENCES:
patent: 5831541 (1998-11-01), Paulson et al.
patent: 5942921 (1999-08-01), Talaga, Jr.
patent: 6107882 (2000-08-01), Gabara et al.
patent: 6611155 (2003-08-01), Sterrantino
Higuchi Tomokazu
Takauchi Hideki
Arent Fox PLLC.
Fujitsu Limited
Tan Vibol
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