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US 7,680,467 B2Granted
Distortion compensating amplifier
AssigneeHitachi Kokusai Electric Inc.
InventorTakeshi Ishigami
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AssigneeHitachi Kokusai Electric Inc.
InventorTakeshi Ishigami
Estimating the term…
In a distortion compensating amplifier that compensates for distortion occurring in main amplifiers, a first amplifying unit amplifies, with a first main amplifier, a first signal consisting of a main signal to be amplified and detects distortion occurring in the first main amplifier, a distortion adjusting unit subjects the distortion detected by the first amplifying unit to vector adjustment, a second amplifying unit combines a second signal consisting of the main signal to be amplified and the distortion supplied from the distortion adjusting unit and amplifies a combined signal with a second main amplifier, and a combining unit combines an amplified signal supplied from the first amplifying unit and an amplified signal supplied from the second amplifying unit.
A distortion compensating amplifier that compensates for distortion occurring in a main amplifier, comprising:
A base station apparatus that amplifies a multi-carrier signal as a main signal, the base station apparatus comprising a distortion compensating amplifier that compensates for distortion occurring in a main amplifier, wherein
A relay station apparatus that amplifies a multi-carrier signal as a main signal, the relay station apparatus comprising a distortion compensating amplifier that compensates for distortion occurring in a main amplifier, wherein
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Modifications of amplifiers to reduce non-linear distortion: using feed-forward
Amplifiers
About 2 years 3 months of term left · ends 14 Jan 2029 (estimated)
1. Field of the Invention
The present invention relates to a distortion compensating amplifier that compensates for distortion occurring in an amplifier that amplifies a signal, and, more particularly to a highly efficient distortion compensating amplifier that realizes highly accurate distortion compensation.
2. Description of the Related Art
In the accompanying drawings:
FIG. 1 is a diagram showing an example of a constitution of a distortion compensating amplifier according to an embodiment of the invention;
FIG. 2A is a diagram showing routes and loops in the distortion compensating amplifier;
An embodiment according to the invention will be explained with reference to the accompanying drawings.
An example of a circuit configuration of a distortion compensating amplifier in this embodiment is shown in FIG. 1.
The distortion compensating amplifier in this embodiment includes a variable phase-shifter (a zeroth variable phase-shifter) 1, a variable attenuator (a zeroth variable attenuator) 2, a preamplifier (a first preamplifier) 3, a hybrid (a first hybrid) 11, a coaxial delay line (a first coaxial delay line) 12, a hybrid (a fourth hybrid) 13, a variable attenuator (a first variable attenuator) 14, a variable phase-shifter (a first variable phase-shifter) 15, a main amplifier (a first main amplifier) 16, a hybrid (a second hybrid) 17, a hybrid (a fifth hybrid) 21, a variable attenuator (a second variable attenuator) 22, a variable phase-shifter (a second variable phase-shifter) 23, a coaxial delay line (a second coaxial delay line) 31, a variable attenuator (a third variable attenuator) 32, a variable phase-shifter (a third variable phase-shifter) 33, a hybrid (a sixth hybrid) 34, a preamplifier (a second preamplifier) 35, a main amplifier (a second main amplifier) 36, and a hybrid (a third hybrid) 37.