Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
1999-03-24
2000-09-05
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
330 51, 330302, H03F 368
Patent
active
06114911&
ABSTRACT:
A power amplifier has an input signal splitting part for splitting the input signal into two output signals each having equal power and phase difference of 180 degrees with respect to each other. A first signal on-off selection part for switching conduction of one of the output signals. A first amplifying part for amplifying the signal from the first signal on-off selection part. A second signal on-off selection part for switching conduction of the signal outputted from the first amplifying part. A second amplifying part for amplifying the other of the output signals from the input signal splitting part. An output signal combining part for providing a phase difference of 180 degrees between the output of the second signal on-off selection part and the output of the second amplifying part and combining them. A bias on-off part for switching on and off at least the first amplifying part, wherein, when the output level is high, the first and second signal on-off selection parts are turned on and, at the same time, the first and second amplifying parts are turned on by the bias on-off part, so that push-pull operation is performed, and when the output level is low, the first and second signal on-off selection parts are turned off and the first amplifying part is turned off by the bias on-off part and the second amplifying part performs single-ended operation.
REFERENCES:
patent: 4590436 (1986-05-01), Butler et al.
patent: 4808942 (1989-02-01), Milkovic
patent: 5256987 (1993-10-01), Kibayashi et al.
patent: 5274341 (1993-12-01), Sekine et al.
patent: 5684430 (1997-11-01), Yamamoto
patent: 5712592 (1998-01-01), Stimson et al.
Enoki Takashi
Ishida Kaoru
Iwai Hiroshi
Kosugi Hiroaki
Morinaga Youichi
Choe Henry
Lee Benny
Matsushita Electric - Industrial Co., Ltd.
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