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US 7,456,688 B2Granted
Signal extraction circuit and distortion-compensated amplifier incorporating the same
AssigneeFujitsu Limited
InventorsYousuke Okazaki, Hiroaki Maeda, Yasushi Seino, Takashi Ono
Life of this patent
Estimating the term…
Abstract
To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted reflected wave is vector-summed with the feedback signal in a vector sum circuit (34).
Claims13
A signal extraction circuit comprising:
- a distributor which is provided between a connecting portion to an antenna and an output of an amplifier, and which extracts a portion of the output of said amplifier as a feedback signal;
- an irreversible element, provided between said connecting portion and the output of said amplifier, for extracting a reflected signal produced at said connecting portion;
- a combining circuit which combines said feedback signal with said reflected signal;
- and
- a vector adjusting circuit which is provided at at least one of a point between said distributor and said combining circuit and a point between said irreversible element and said combining circuit, and which is capable of adjusting at least one of the phase and amplitude of the signal input thereto.
2 more elements
A distortion-compensated amplifier comprising:
- an amplifier for amplifying a signal;
- a distributor, which is provided between a connecting portion to an antenna and an output of said amplifier, and which extracts a portion of the output of said amplifier as a feedback signal;
- a predistorter which, based on an input to said amplifier and on said feedback signal, corrects the input to be applied to said amplifier and thereby cancels distortion occurring in said amplifier;
- an irreversible element, provided between said connecting portion and the output of said amplifier, for extracting a reflected signal produced at said connecting portion;
- a combining circuit which combines said feedback signal with said reflected signal and thereby generates the feedback signal to be supplied to said predistorter;
- and
- a vector adjusting circuit which is provided at at least one of a point between said distributor and said combining circuit and a point between said irreversible element and said combining circuit, and which is capable of adjusting at least one of the phase and amplitude of the signal input thereto.
4 more elements
Dependencies are inferred from the claim text.