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Digital pre-distorter for high-field MRI high-power radio frequency power amplifier

A digital predistortion, radio frequency power amplifier technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, amplifiers, components of amplifying devices, etc.

Active Publication Date: 2016-09-28
NANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a high-power RF power amplifier for high-field MRI that can simultaneously compensate for the nonlinear distortion caused by the RF power amplifier itself and the linearity deterioration caused by IQ defects, and has high pre-distortion accuracy. digital predistorter

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  • Digital pre-distorter for high-field MRI high-power radio frequency power amplifier
  • Digital pre-distorter for high-field MRI high-power radio frequency power amplifier

Examples

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Effect test

Embodiment 1

[0012] Embodiment one: if figure 1 As shown, a digital predistorter for high-field MRI high-power RF power amplifier, including a first pre-distortion model, a second pre-distortion model, an IQ compensation model and a switch, the first pre-distortion model is used for the first The first segment of the original baseband data sequence is pre-distorted, the second pre-distortion model is used to pre-distort the second segment of the original baseband data sequence, and the first segment of the original baseband data sequence is extracted at the input end of the high-field MRI high-power RF power amplifier The original baseband data sequence from the first original baseband data to the original baseband data with the largest modulus, the second original baseband data sequence is the remaining original baseband data sequence after removing the first original baseband data sequence A sequence composed of baseband data; when the pre-distortion starts, the original baseband data se...

Embodiment 2

[0014] Embodiment two: if figure 1 As shown, a digital predistorter for high-field MRI high-power RF power amplifier, including a first pre-distortion model, a second pre-distortion model, an IQ compensation model and a switch, the first pre-distortion model is used for the first The first segment of the original baseband data sequence is pre-distorted, the second pre-distortion model is used to pre-distort the second segment of the original baseband data sequence, and the first segment of the original baseband data sequence is extracted at the input end of the high-field MRI high-power RF power amplifier The original baseband data sequence from the first original baseband data to the original baseband data with the largest modulus, the second original baseband data sequence is the remaining original baseband data sequence after removing the first original baseband data sequence A sequence composed of baseband data; when the pre-distortion starts, the original baseband data se...

Embodiment 3

[0017] Embodiment three: as figure 1 As shown, a digital predistorter for high-field MRI high-power RF power amplifier, including a first pre-distortion model, a second pre-distortion model, an IQ compensation model and a switch, the first pre-distortion model is used for the first The first segment of the original baseband data sequence is pre-distorted, the second pre-distortion model is used to pre-distort the second segment of the original baseband data sequence, and the first segment of the original baseband data sequence is extracted at the input end of the high-field MRI high-power RF power amplifier The original baseband data sequence from the first original baseband data to the original baseband data with the largest modulus, the second original baseband data sequence is the remaining original baseband data sequence after removing the first original baseband data sequence A sequence composed of baseband data; when the pre-distortion starts, the original baseband data ...

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Abstract

The invention discloses a digital pre-distorter for a high-field MRI high-power radio-frequency power amplifier. The digital pre-distorter comprises a first pre-distortion model, a second pre-distortion model, an IQ compensation model and a switching switch. The first pre-distortion model is used for carrying out pre-distortion on a first segment of an original baseband data sequence. The second pre-distortion model is used for carrying out pre-distortion on a second segment of the original baseband data sequence. The first segment of the original baseband data sequence is the sequence composed of data starting from a first piece of original baseband data to the original baseband data with the maximum module value in the original baseband data, wherein the original baseband data is extracted at the input end of the high-field MRI high-power radio-frequency power amplifier. The second segment of the original baseband data sequence is the sequence composed of the residual original baseband data of the original baseband data sequence except the first segment of the original baseband data sequence. The digital pre-distorter has the advantages that the nonlinear distortion resulting from the self cause of the radio-frequency power amplifier and the linear distortion resulting from IQ defects can be compensated, and the pre-distortion precision is high.

Description

technical field [0001] The invention relates to a digital predistorter, in particular to a digital predistorter used for a high-field MRI radio frequency power amplifier. Background technique [0002] High-power RF power amplifiers for high-field MRI, under the action of high-power dynamic range Singer pulse signals, show bifurcations on the AM / AM and AM / PM curves, that is, high-power RF power amplifiers for high-field MRI have large dynamic range bifurcations. linear. In addition, high-field MRI high-power RF power amplifiers are driven by quadrature modulators to generate radio frequency signals. Due to the IQ defects of quadrature modulators (ie, defects such as IQ imbalance and DC leakage), the IQ defects will cause problems with quadrature Linearity degradation of high-power RF power amplifiers for high-field MRI with fully separated modulators. The existing digital predistorter of the radio frequency power amplifier only compensates the nonlinear distortion caused by...

Claims

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Application Information

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IPC IPC(8): H03F1/32
CPCH03F1/3241
Inventor 惠明张新刚鲁道邦海涛张萌
Owner NANYANG NORMAL UNIV
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