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US 9,263,994 B2Granted
Amplifying device, distortion compensating device, and amplifying method
AssigneeFujitsu Limited
InventorsNobukazu Fudaba, Hiroyoshi Ishikawa, Yuichi Utsunomiya, Toshio Kawasaki, Kazuo Nagatani
Life of this patent
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Abstract
An amplifying device including: a first amplifier configured to generate a first output signal by amplifying an input signal, a second amplifier configured to generate a second output signal by amplifying the first output signal, and a processor configured to perform a first compensation by compensating a distortion for the second amplifier in accordance with the first output signal and the second output signal.
Claims17
An amplifying device comprising:
- a first amplifier configured to generate a first output signal by amplifying an input signal;
- a second amplifier configured to generate a second output signal by amplifying the first output signal;
- and
- a processor configured to:
- perform first compensation by compensating distortions in the second amplifier based on a difference between the first output signal and the second output signal;
- and
- perform second compensation by compensating distortions in the first amplifier based on a difference between the input signal and the first output signal.
4 more elements
An amplifying method comprising:
- generating a first output signal by amplifying an input signal by a first amplifier;
- generating a second output signal by amplifying the first output signal by a second amplifier;
- performing first compensation by compensating distortions in the second amplifier based on a difference between the first output signal and the second output signal;
- and
- performing second compensation by compensating distortions in the first amplifier based on the input signal and the first output signal.
2 more elements
An amplifying device comprising:
- a first pre-distortion circuit configured to receive an input signal and to output a first output signal, the first pre-distortion circuit being controlled by a first parameter;
- a second pre-distortion circuit configured to receive the first output signal and to output a second output signal, the second pre-distortion circuit being controlled by a second parameter;
- a first amplifier configured to receive the second output signal and to output a third output signal by amplifying the second output signal;
- a second amplifier configured to receive the third output signal and to output a fourth output signal by amplifying the third output signal;
- and
- third pre-distortion circuit coupled to the first pre-distortion circuit, the third pre-distortion circuit being controlled by a third parameter, wherein:
- the third parameter is set based on the third output signal and the fourth output signal, and
- after the third parameter is set, the first parameter is set based on the third parameter.
5 more elements
An amplifying apparatus comprising:
- a first pre-distortion circuit configured to receive an input signal and to output a first output signal, the first pre-distortion circuit being controlled by a first parameter;
- a second pre-distortion circuit configured to receive the first output signal and to output a second output signal, the second pre-distortion circuit being controlled by a second parameter;
- a first amplifier configured to receive the second output signal and to output a third output signal by amplifying the second output signal;
- a second amplifier configured to receive the third output signal and to output a fourth output signal by amplifying the third output signal;
- and
- a distortion compensation device configured to:
- select one of the first output signal, the second output signal, and the third output signal, as a reference signal;
- select one of the third output signal and the fourth output signal, as a feedback signal;
- and
- iteratively determine the first parameter or the second parameter based on a difference between the reference signal and the feedback signal.
7 more elements
Dependencies are inferred from the claim text.