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Analog predistortion based linear power amplification circuit and method

A technology of linear power and amplifying circuits, which is applied in the field of linear power amplifying circuits and linear power amplifying. It can solve the problems of output vector signal amplitude and phase deviation, adjacent channel signal interference, and amplitude distortion, so as to improve linearity and occupy PCB area. The effect of small size and wide working bandwidth

Active Publication Date: 2009-10-28
AUCTUS TECH CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] like figure 1 The basic principle of analog predistortion technology: when the non-constant envelope signal is amplified by a high power amplifier with a small power margin, the part with higher peak value will produce amplitude distortion due to the nonlinear saturation of the high power amplifier (AM -AM) and phase distortion (AM-PM), resulting in a deviation in the amplitude and phase of the output vector signal, and at the same time causing spectrum expansion and interference with adjacent channel signals

Method used

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  • Analog predistortion based linear power amplification circuit and method
  • Analog predistortion based linear power amplification circuit and method
  • Analog predistortion based linear power amplification circuit and method

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Embodiment Construction

[0024] The linear power amplification circuit based on analog predistortion of the present invention is as figure 2 As shown, it includes sequentially connected: pre-amplifier U1, first temperature-controlled attenuator U2, analog predistorter, second temperature-controlled attenuator U3, push-pull amplifier U4, and final high-power amplifier U5. The push-pull amplifier U4 and the final high-power amplifier U5 use LDMOS (Laterally Diffused Metal Oxide Semiconductor).

[0025]First, the RF input signal is adjusted by the pre-amplifier U1 to meet the input power requirements of the analog predistorter; then the adjusted signal enters the first temperature-controlled attenuator U2 to compensate for the change in the operating point of the analog predistorter when the temperature changes. Drift; the compensated signal passes through the analog predistorter to output the RF output signal with the predistortion signal; the signal passes through the second temperature-controlled att...

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Abstract

The invention discloses a linear power amplifying circuit based on analog predistortion, which comprises sequentially connected: a preamplifier, a first temperature-controlled attenuator, an analog predistorter, a second temperature-controlled attenuator, a push-pull amplifier, and a final stage high power amplifier. The invention also discloses a method using the circuit, by adding an analog predistorter circuit with a relatively simple topology to generate a predistortion signal to balance the distorted signal of the power amplifier, and by adjusting the power tube of the push-pull amplifier and the final high-power amplifier The matching circuit and bias voltage make the two power tubes complement each other in amplitude and phase to achieve the effect of pre-distortion, so that the RF output signal can achieve better linearity. The invention has the advantages of simple circuit form, high working efficiency, small occupied PCB area and low cost, and is very suitable for multi-carrier linear power amplifier circuits of TD-SCDMA base stations and repeater systems.

Description

technical field [0001] The invention relates to a power amplifying circuit, in particular to a linear power amplifying circuit based on analog predistortion. The invention also relates to a linear power amplification method using the circuit. Background technique [0002] With the rapid advancement of the industrialization process of the third generation (3G) mobile communication technology, especially the TD-SCDMA (Time Division Synchronous Code Division Multiple Access) standard, various wireless communication services continue to increase , the requirements for the capacity of the communication system are also increasing. In order to pursue higher data rate and spectral efficiency, the linear modulation method and multi-carrier technology commonly used in third-generation mobile communications will cause drastic changes in the signal envelope, which will cause peak compression and intermodulation distortion in the transmitting power amplifier. Such peak compression and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32H03F3/20H03F3/217
Inventor 夏瑜韩华
Owner AUCTUS TECH CO LTD
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