Amplifiers – With amplifier bypass means
Patent
1998-10-23
2000-10-17
Pascal, Robert
Amplifiers
With amplifier bypass means
330149, H03F 100
Patent
active
061337919
ABSTRACT:
A feedforward amplifier which includes a distortion detector, a distortion eliminator, an error power extractor, a first level detector and a first controller. The error power extractor extracts output error power due to variations in the distortion eliminator by combining the output signal from the distortion eliminator with the signal from a first linear signal path in the distortion detector in opposite phases. The first level detector detects the output error power extracted by the error power extractor, and the first controller controls a first variable attenuator and a first phase shifter which are interposed in the distortion eliminator such that the output error power is maintained at zero. This can solve a problem of a conventional feedforward amplifier in that the power level of the pilot signal must be increased to heighten the detection sensitivity of the pilot signal because the detection level of the pilot signal becomes minimum at an optimum operation point, and that the increasing power of the pilot signal degrades the communication quality of a system employing the conventional feedforward amplifier.
REFERENCES:
patent: 4389618 (1983-06-01), Bauman
patent: 5485120 (1996-01-01), Anvari
patent: 5491454 (1996-02-01), Matz
patent: 5877653 (1999-03-01), Kim et al.
Horiguchi Kenichi
Ikeda Yukio
Nakayama Masatoshi
Senda Haruyasu
Takagi Tadashi
Choe Henry
Mitsubishi Denki & Kabushiki Kaisha
Pascal Robert
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