Amplifier

A technique for amplifying devices and amplifying parts, which is applied to the components of amplifying devices, amplifiers, and improved amplifiers to reduce nonlinear distortion, etc., which can solve problems such as difficulties in realization, and achieve low cost, reduced error, and light weight.

Inactive Publication Date: 2003-03-19
KOKUSA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] However, in order to align the phases, higher-precision phase control than that of the amplifying device shown in FIG. 5 is required, but it is difficult to realize, and it becomes a problem to improve the performance of distortion compensation.

Method used

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Embodiment Construction

[0034] Embodiments of the present invention will be described below with reference to the drawings.

[0035] Furthermore, in the function realizing part described below, any circuit or device may be used as long as the function can be realized, and a part or all of the functions may be realized by software. Furthermore, the function realization part may be realized by a plurality of circuits, or a plurality of function realization parts may be realized by a single circuit.

[0036] In the amplifying device according to the embodiment of the present invention, in the digital quadrature modulation part, the digital quadrature modulation input signal for each type of carrier is subjected to offset rotation processing, synthesized in the combination part, instead of the analog delay line, and the digital delay is fixed. The digital delay part of the time is used in the main signal system or the control system, and the multi-carrier signal is given in the distortion compensation pa...

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Abstract

To provide an amplifying device which is reduced in size, weight and cost and which can improve the distortion compensation performance. In the amplifying device, input signals are each subjected to digital orthogonal modulation using an IF and further to offset rotation processing in digital orthogonal modulators, then bifurcated into a main signal system and a control system, and detection of a power value is performed at an IF band in a power detecting section of the control system. Therefore, offset rotation processing of the input signals in the power detection is not required, so that a structure for matching phases of a multi-carrier signal and a power value signal is not required, resulting in improving the distortion compensation performance without using an analog delay line.

Description

technical field [0001] The present invention relates to a mobile communication system such as a mobile phone, and particularly to an amplifier used in a base station device. Background technique [0002] In a mobile communication system such as a mobile phone, in a base station device, since a radio signal needs to reach a physically distant mobile station device, it is necessary to greatly amplify the signal to be transmitted with an amplifier before transmitting it. [0003] In the mobile communication system described above, a W-CDMA (Wideband Code Division Multiple Access) system or the like is used as a mobile communication system. [0004] However, because amplifiers are analog devices, their input-output characteristics are nonlinear functions. In particular, after the amplification limit point called the saturation point, even if the power input to the amplifier is amplified, the output power is substantially constant. [0005] Then, non-linear distortion occurs du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H04B1/04H04B1/62H04L27/00H04L27/26
CPCH04B1/62H03F1/3252H03F1/3247H04B1/0475
Inventor 本江直树大久保阳一须藤雅树宫谷彻彦
Owner KOKUSA ELECTRIC CO LTD
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