Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Reexamination Certificate
2007-01-30
2007-01-30
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
C330S301000, C330S302000
Reexamination Certificate
active
10963732
ABSTRACT:
Between an output terminal (drain terminal) of a semiconductor device in a first unit amplifier and an output port, a −90 degrees phase-shift circuit is connected, while between an output terminal (drain terminal) of a semiconductor device in a second unit amplifier and the output port, a +90 degrees phase-shift circuit is connected. Between the first and second ports, there is inserted a series circuit made up of first and second inductance components with an almost identical size. Then, to a middle point between the first and second inductance components, a bias feed terminal is connected, and between the middle point and a ground, a series circuit made up of a resistance component and a capacitance component is connected. The small-size balanced amplifier circuit can perform accurate balance operation in wide bands.
REFERENCES:
patent: 5625205 (1997-04-01), Kusama
patent: 6954623 (2005-10-01), Chang et al.
patent: 2001-267857 (2001-09-01), None
Nguyen Hieu
Pascal Robert
Sharp Kabushiki Kaisha
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