Nonlinearity extractor of ultra-wideband radio-frequency power amplifier

A technology of radio frequency power and ultra-wideband, which is applied in the field of nonlinear characteristic extraction devices, can solve the problems that the nonlinear characteristics of ultra-wideband radio frequency power amplifiers cannot be extracted, the development of broadband wireless communication technology is limited, and the conversion accuracy is difficult to achieve. Achieve high-precision extraction, offset undistorted signals, and accurate error extraction

Active Publication Date: 2014-12-03
NINGBO UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

With the current manufacturing process level of analog-to-digital converters, even if such a high conversion efficiency can be achieved, it is difficult to meet the conversion accuracy requirements, so that the existing analog-to-digital converters cannot be applied to the output signal of an ultra-wideband RF power amplifier. Sampling, unable to extract the nonlinear characteristics of ultra-wideband RF power amplifiers that meet the requirements of digital pre-distortion technology, it is difficult to perform linear modeling on it, which limits the development of broadband wireless communication technology

Method used

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  • Nonlinearity extractor of ultra-wideband radio-frequency power amplifier
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  • Nonlinearity extractor of ultra-wideband radio-frequency power amplifier

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Embodiment 1

[0025] Embodiment one: if figure 2As shown, a device for extracting nonlinear characteristics of an ultra-wideband RF power amplifier includes a first coupler 1, a second coupler 2, a first mixer 3, a second mixer 4, a first attenuator 5, The first analog-to-digital converter 6, the second analog-to-digital converter 7 and the error separation module 9, the input end of the first coupler 1 is used to access the radio frequency input signal RF1, and the output end of the first coupler 1 is used to connect the radio frequency The signal input end of power amplifier 10 (being the ultra-wideband radio frequency power amplifier), the coupling end of the first coupler 1 is connected with the input end of the first mixer 3, and the output end of the first mixer 3 is connected with the first modulus The input end of the converter 6 is connected, the input end of the second coupler 2 is used to connect the signal output end of the radio frequency power amplifier 10, the coupling end o...

Embodiment 2

[0029] Embodiment two: if image 3 As shown, this embodiment is basically the same as Embodiment 1, the only difference is that the input end of the phase shifter 91 is connected to the coupling end of the first coupler 1 through the second attenuator 93, when the second attenuator 93 is added , the amplitude balance between the signals coupled from the signal input end and the signal output end of the radio frequency power amplifier 10 can be adjusted more precisely, so that the error extraction is more accurate.

[0030] In the above specific embodiments, both the first attenuator 5 and the second attenuator 93 may be variable attenuators, and the phase shifter 91 may be an adjustable phase shifter.

[0031] The second technical solution of the present invention is an intermediate frequency cancellation scheme: as Figure 4 As shown, a device for extracting nonlinear characteristics of an ultra-wideband RF power amplifier includes a first coupler 1, a second coupler 2, a fi...

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Abstract

The invention discloses a nonlinearity extractor of an ultra-wideband radio-frequency power amplifier. The nonlinearity extractor comprises a radio frequency neutralizing scheme and an intermediate frequency neutralizing scheme. The radio frequency neutralizing scheme includes: disposing an error separation module at a coupling end of a first coupler and an output end of a first attenuator, performing radio frequency neutralizing to radio frequency signals through the error separation module, and clearing linear amplified radio frequency components in the band to obtain error signals by separating. The intermediate frequency neutralizing scheme includes: disposing an error separation module at an output end of a first mixer and an output end of a second mixer, performing intermediate frequency neutralizing to low and intermediate frequency signals, and clearing linear amplified intermediate frequency components in the band to obtain error signals by separating. By the nonlinearity extractor, dynamic range of the obtained error signals is reduced greatly, high-speed analog to digital converter with lower conversion precision can be used to sample the error signals, and the requirement of conversion precision of the high-speed analog-digital converter in nonlinearity extraction of the ultra-wideband radio-frequency power amplifier is lowered greatly.

Description

technical field [0001] The invention relates to a nonlinear characteristic extraction device, in particular to an ultra-wideband radio frequency power amplifier nonlinear characteristic extraction device. Background technique [0002] Modern broadband wireless communication systems widely use non-constant envelope modulation methods such as Orthogonal Frequency Division Multiplexing (OFDM) and Quadrature Amplitude Modulation (QAM). The linearity requirement of the RF power amplifier in the system is very high. Digital pre-distortion technology can not only ensure that the RF power amplifier works in a high-efficiency state, but also effectively improve its linearity, and is currently widely used in wireless communication systems. [0003] In the digital predistortion technology, in order to perform linearization modeling, at least the third-order intermodulation signal (IMD3) of the RF power amplifier must be obtained first, that is, the nonlinear characteristics of the RF ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/12H03F1/32
Inventor 刘太君许高明叶焱惠明徐铁峰聂秋华
Owner NINGBO UNIV
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