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A method to improve linearity of radio-frequency power amplifier, system and baseband

A technology of radio frequency power and amplifier, which is applied in the field of radio frequency power amplifiers, can solve problems such as the deterioration of power amplifier linearity, the influence of TD-SCDMA mobile terminal transmission system transmission performance, and the deterioration of linearity, etc., and achieve the effect of good linearity

Inactive Publication Date: 2007-05-16
VIMICRO CORP
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AI Technical Summary

Problems solved by technology

[0006] The RF transmitter is an analog system, and its linearity will deteriorate with the increase of the internal gain control signal. That is to say, when the power amplifier is required to output the maximum power, the internal gain control signal of the RF transmitter increases. If If the value range of the gain control signal that keeps the output signal of the RF transmitter with good linearity is exceeded, the linearity of the output signal of the RF transmitter will deteriorate, that is, the linearity of the input signal of the power amplifier will deteriorate, which will eventually lead to the failure of the power amplifier. linearity deterioration
[0007] In short, in the existing TD-SCDMA mobile terminal transmission system, when the power amplifier is determined, the linearity of the power amplifier cannot be changed because the size of the IQ signal output from the baseband to the RF transmitter is fixed.
In this case, if the linearity of the power amplifier is poor, the transmission performance of the TD-SCDMA mobile terminal transmission system will be greatly affected

Method used

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  • A method to improve linearity of radio-frequency power amplifier, system and baseband
  • A method to improve linearity of radio-frequency power amplifier, system and baseband

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Embodiment Construction

[0044] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0045] The core idea of ​​the present invention is: by adjusting the size of the IQ signal sent from the baseband to the radio frequency transmitter, the signal output from the radio frequency transmitter to the power amplifier has good linearity, thereby ensuring that the power amplifier has good linearity.

[0046]The method for improving the linearity of radio frequency power amplifier of the present invention, comprises the steps:

[0047] A. The baseband obtains the output power of the radio frequency power amplifier required by the current system from the received upper layer signaling, and determines the magnitude of the IQ signal output to the radio frequency transmitter according to the obtained output power.

[0048] B. The b...

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Abstract

The disclosed method for increasing RF power amplifier linearity comprises: base band acquires output power of current RF power amplifier from received top signaling to determine the size of IQ signal for RF transmitter; the base band sends IQ signal to target, and the latter processes gain or received IQ signal to send signal to a RF power amplifier. This invention can ensure the output signal linearity so as well as the RF power amplifier.

Description

technical field [0001] The invention relates to radio frequency power amplifier technology, in particular to a method, system and baseband for improving the linearity of radio frequency power amplifier in time division-synchronous code division multiple access (TD-SCDMA) system. Background technique [0002] FIG. 1 is a structural diagram of a TD-SCDMA mobile terminal transmitting system in the prior art, and the system includes: a baseband 101 and a transmitting part. The transmitting part of the system is composed of a radio frequency transmitter 102, a radio frequency power amplifier (PA) 103, an antenna switch and an antenna. The radio frequency transmitter 102 receives the IQ signal output by the baseband 101, and performs gain processing on the signal, and outputs it to the radio frequency power amplifier 103, and the radio frequency power amplifier 103 amplifies the received signal and transmits it through the antenna switch and the antenna. [0003] For the convenie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/005H04B1/707H04L25/02H04W52/52
Inventor 郭为
Owner VIMICRO CORP
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