Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1997-08-11
2000-04-25
Lee, Benny
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
330147, 330148, H03F 3191
Patent
active
060549025
ABSTRACT:
A high-frequency amplifier that can reduce the size, weight and price of a device that contains this high-frequency amplifier. The high-frequency amplifier has, for example, an input matching circuit of the low-pass type and an input matching circuit of the high-pass type, connected in parallel and provided at the input side or terminal of a power amplification circuit. Matching is thereby performed corresponding to either one of two kinds of transmission input signals, whose frequencies are different from each other, by the input matching circuit of the low-pass type, and by the input matching circuit of the high-pass type, respectively. Moreover, for example, an output matching circuit of the low-pass type and an output matching circuit of the high-pass type are connected in parallel and provided at the output side or terminal of the power amplification circuit. Matching is performed corresponding to either one of two transmission output signal frequencies by the output matching circuit of the low-pass type, and the output matching circuit of the high-pass type, respectively.
REFERENCES:
patent: 4107621 (1978-08-01), Furutani et al.
patent: 4803443 (1989-02-01), Takagi et al.
patent: 5420541 (1995-05-01), Upton et al.
Lee Benny
Murata Maufacturing Co., Ltd.
Nguyen Khanh Van
LandOfFree
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