Amplifiers – With pilot frequency control means
Reexamination Certificate
2005-01-04
2005-01-04
Nguyen, Khanh Van (Department: 2817)
Amplifiers
With pilot frequency control means
C330S151000
Reexamination Certificate
active
06838934
ABSTRACT:
In a feedforward amplifier with a dual loop in which a distortion injection path of a distortion elimination circuit50is provided as a feedforward configuration composed of a first auxiliary amplifier distortion elimination circuit60and a first auxiliary amplifier distortion elimination circuit, a second variable attenuator55and a second variable phase shifter56are provided preceding the distortion detection circuit60,a second pilot signal injected between stages of a main amplifier14is detected by a directional coupler85,and the second variable attenuator55and the second variable phase shifter56are controlled by a second controller97to minimize the level of the detected second pilot signal, thereby bringing the distortion elimination circuit and the first auxiliary distortion detection circuit into balance at the same time.
REFERENCES:
patent: 5304945 (1994-04-01), Myer
patent: 5977826 (1999-11-01), Behan et al.
patent: 6166600 (2000-12-01), Myer
patent: 6320461 (2001-11-01), Lee
patent: 6320464 (2001-11-01), Suzuki et al.
patent: 1003278 (2000-05-01), None
patent: 1041712 (2000-10-01), None
patent: 7-77330 (1995-08-01), None
patent: 2000-286645 (2000-10-01), None
patent: 2000-353923 (2000-12-01), None
patent: WO01912863 (2001-11-01), None
Toshio Nojima, et al. “Extremely Low-Distortion Multi-Carrier Amplifier for Mobile Communication Systems-Self-Adjusting Feed-Forward Amplifier” NTT Radio Communication Systems Laboratories, pp. 21-28.
Nojima Toshio
Suzuki Yasunori
Nguyen Khanh Van
NTT DoCoMo Inc.
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