Circuit capable of improving linearity of power amplifier

A power amplifier and linearity compensation technology, applied in power amplifiers and other directions, can solve problems such as complex system structure, and achieve the effects of simple circuit structure, easy integration and implementation, and convenient control

Active Publication Date: 2014-04-09
北京昂瑞微电子技术股份有限公司
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  • Application Information

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Problems solved by technology

In the pre-distortion technology, the baseband signal pre-distortion system needs to correctly compare the source signal an...

Method used

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  • Circuit capable of improving linearity of power amplifier
  • Circuit capable of improving linearity of power amplifier
  • Circuit capable of improving linearity of power amplifier

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Embodiment Construction

[0018] In order to facilitate the understanding of those skilled in the art, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The nonlinear distortion of the power amplifier includes amplitude-amplitude distortion (AM-AM) and amplitude-phase distortion (AM-PM), where AM-AM conversion is equivalent to adding an amplitude modulation signal to an ideal amplifier, which mainly affects the power amplifier. Intermodulation index; while AM-PM conversion is equivalent to adding a phase modulation signal to an ideal power amplifier, which mainly affects the spectrum regeneration index of the power amplifier adjacent channel, power leakage ratio (ACPR). like figure 1 is the amplitude-amplitude distortion characteristic of the power amplifier. It can be seen from the figure that as the input signal Pin increases, the gain Gain of the power amplifier will be compressed to a certain extent; figure 2 It...

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Abstract

The invention relates to a circuit capable of improving the linearity of a power amplifier. The circuit comprises a power amplifier circuit, wherein a linearity compensating circuit is arranged at the front end of the power amplifier circuit and comprises a current source, a voltage clamp transistor, a state compensating transistor and an isolation resistor, the current source and the voltage clamp transistor are connected to the ground in series and provide bias voltage for the power amplifier circuit, the isolation resistor is connected between the current source and the signal input end of the power amplifier circuit in series, the state compensating transistor is connected between the current source and the signal input end of the power amplifier circuit in series, and the voltage clamp transistor and the state compensating transistor can be diodes, audios, NMOS tubes and the like. The amplitude distortion and phase distortion generated by the power amplifier can be compensated effectively through the simulated predistortion technology. The circuit is simple in structure, convenient to control, and easy to integrate and implement, and the effect of improvement on the linearity of the power amplifier is remarkable.

Description

technical field [0001] The invention relates to the technical field of radio frequency power amplifiers, in particular to a circuit for improving the linearity of power amplifiers by using analog predistortion technology. Background technique [0002] With the development of wireless communication technology, various linearization techniques for RF power amplifiers are further studied and applied. In particular, the development of technologies such as narrowband CDMA and third-generation mobile communications have put forward higher requirements on the linearity of power amplifiers. In wireless communication systems such as W-CDMA, if a general high-power amplifier is used, due to the intermodulation distortion of the power amplifier, there will be a spectrum regeneration effect, which will interfere with adjacent channels and even cause bit errors. Therefore, the linearization technology of power amplifiers has attracted more and more attention. Currently, three commonly ...

Claims

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Application Information

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IPC IPC(8): H03F3/21
Inventor 刘元
Owner 北京昂瑞微电子技术股份有限公司
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