Amplifiers – With amplifier bypass means
Reexamination Certificate
2006-10-24
2006-10-24
Choe, Henry (Department: 2817)
Amplifiers
With amplifier bypass means
C330S149000
Reexamination Certificate
active
07126422
ABSTRACT:
A multi-band feed-forward amplifier is formed by: a dividing part for dividing and applying an input signal containing signals of multiple frequency bands to a linear signal path and N vector adjustment paths of a distortion detecting circuit; frequency band signal extractors provided in the N vector adjustment paths, respectively, for extracting signals of N frequency bands; N vector adjusters for adjusting the vectors of the output signals from the respective frequency band signal extractors; a main amplifier for amplifying the output signals from the N vector adjusters; a combining/dividing part for combining the amplified signals and the signal from the linear signal path of the distortion detecting circuit and for dividing and applying the combined output to a linear signal path and N distortion injection paths of a distortion cancelling circuit; frequency band signal extractors provided in the N distortion injection paths, respectively, for extracting the signals of the N frequency bands; vector adjusters for adjusting the vectors of signals separated into the N frequency bands; an auxiliary amplifying part for amplifying the vector-adjusted N signals; and a combining part for combining the amplified signals and the signal from the linear signal path of the distortion cancelling circuit.
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Toshio Nojima, et al., “Extremely Low-Distortion Multi-Carrier Amplifier for Mobile Communication Systems—Self Adjusting Feed-Forward Amplifier (SAFF-A)”, Technical Report of Institute of Electronics Information and Communication Engineers of Japan, NTT Radio Communication Systems Laboratories, RCS90-4, 1990, pp. 21-28 (with partical English translation).
Narahashi Shoichi
Suzuki Yasunori
Choe Henry
NTT DoCoMo Inc.
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