Variable Vector Hybrid Superposition Predistortion Linearization Method

A hybrid superposition and pre-distortion technology, which is applied to amplifiers with semiconductor devices/discharge tubes, amplifiers, electrical components, etc., can solve the problems of small signal gain flatness, narrow bandwidth, and narrow operating bandwidth of linearizers. It achieves the effects of novel structure, easy processing, and improved standing wave performance of circuit ports and in-band flatness performance

Active Publication Date: 2020-06-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transmission predistortion circuit is mainly realized by a parallel nonlinear diode circuit, which has the effect of linearizing the solid-state power amplifier, but the linearizer has a narrow operating bandwidth and poor small-signal gain flatness (see literature: K.Yamauchi and K.mori , "A MICROWAVE MINIATURIZED LINEARIZER USING A PARALLELDIODE", IEEE Conference Publications, 1997, 3:1199-1202)
However, the traditional reflective predistortion linearization circuit can only realize the linearization of the nonlinear predistortion of the traveling wave tube amplifier, and has the disadvantage of narrow operating frequency band (see literature: Liu Jie, Zhang Hua-Dong and li zeng-liang, "A novel two-branch predistortion linearizer of Ku band TWTA in communication applications", IET Conference Publications, 2015, 1-3)
Therefore, the main technical defects of the existing traditional pre-distortion linearization technology are: 1. The traditional reflective pre-distortion linearizer can only produce pre-distortion effects on traveling wave tube power amplifiers, but cannot produce pre-distortion effects on solid-state power amplifiers; 2. When the frequency changes, the characteristics of the nonlinear device in the traditional predistortion linearizer will also change, so the bandwidth of the traditional predistortion linearizer is generally very narrow; 3. The traditional predistortion linearizer When the input signal of the amplifier is a small signal, its gain fluctuates greatly, and the in-band gain flatness is poor

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  • Variable Vector Hybrid Superposition Predistortion Linearization Method
  • Variable Vector Hybrid Superposition Predistortion Linearization Method
  • Variable Vector Hybrid Superposition Predistortion Linearization Method

Examples

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Embodiment 1

[0049] When Freq=14GHz, R1=1000Ω, V1=1V~2.5V, it can be obtained as image 3 The amplitude predistortion curve shown and as Figure 4 The phase predistortion curve shown. like Figure 7 As shown, the entire variable vector hybrid superimposed predistortion linearizer has the best standing wave when it is near 14GHz, and S11 is below -30dB; the input power is within the range of -30dBm~﹢20dBm, and the predistorter's The amplitude of the transmission coefficient increases non-linearly, and the increase range is 7dB-8.7dB; the phase of the transmission coefficient of the predistorter is nonlinearly compressed, and the variation range is -17°~-66°. This example shows that under certain bias conditions, the variable vector hybrid superposition predistortion linearizer can produce a predistortion effect of gain expansion and phase compression as the input power increases. It can meet the pre-distortion requirements of solid-state power amplifiers, and this example shows that the ...

Embodiment 2

[0051] When Freq=13GHz~16GHz, V1=1V, R1=1000Ω, it can be obtained as Figure 5 The amplitude predistortion curve shown and as Image 6 The phase predistortion curve shown. It can be seen from the figure that in the frequency range of 13GHz-16GHz, the input power ranges from -30dBm to +20dBm, the transmission coefficient amplitude of the variable vector hybrid superposition predistortion linearizer increases nonlinearly, and the increase range is 6.9dB ~8.7dB; the phase of the transmission coefficient of the predistorter is nonlinearly compressed, and the variation range is -17°~-44°; Figure 8 As shown, in the frequency range of 13GHz to 16GHz, its S11 is less than -13dB. This example shows that under certain bias conditions, the variable vector hybrid superposition predistortion linearizer can produce gain expansion and phase compression characteristics with the increase of input power in a relatively wide frequency band, and can be used in a relatively wide frequency band....

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Abstract

The invention discloses a variable vector hybrid superimposed predistortion linearization method suitable for improving the linearity of a microwave millimeter wave solid-state power amplifier. According to the variable vector hybrid superimposed predistortion linearization method, on the basis of the working mechanism of the traditional diode reflected predistortion linearization, an effect of phase compression generated by gain expansion with the increase of the input power is realized by using the variable vector hybrid superimposing principle, good port standing wave is realized, and the purpose compensating the nonlinear distortion of the solid-state power amplifier within the microwave millimeter wave broad band is realized. By adoption of the variable vector hybrid superimposed predistortion linearization method, the defect that the traditional reflected simulated predistortion technology can only generate phase expansion with the increase of the input power and is only applicable to linear traveling wave tube power amplifiers, breaks through the limitation of the reflected predistortion circuit bandwidth; and the variable vector hybrid superimposed predistortion linearization method has the advantages of novel structure, simple and compact structure, easy processing and assembly, and is suitable for popularization and application in the technical field of microwave millimeter wave predistortion linearization.

Description

technical field [0001] The invention relates to the technical field of microwave and millimeter wave linearization, in particular to a variable vector hybrid superposition predistortion linearization method suitable for microwave and millimeter wave solid-state power amplifiers. Background technique [0002] The development direction of modern wireless communication systems is multi-user, high-capacity, high-quality communication with higher signal transmission rates, which makes microwave communication systems with wider operating frequency bands and higher information capacity attract more and more attention. The current microwave communication system mostly adopts broadband, multi-carrier, and complex digital modulation technology. This kind of modulation method puts forward extremely high requirements on the linearity of the channel, and the microwave power amplifier of the transmitter is the main factor affecting the linearity of the channel. In a microwave communicatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/02H03F3/21H03F3/24
CPCH03F1/0205H03F3/21H03F3/245
Inventor 谢小强穆继超杨超吴健苇佘宇琛赵轩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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