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Method and system for nonlinear correction of power amplifier

A nonlinear correction and amplifier technology, applied in the field of nonlinear correction and correction systems, can solve problems such as large nonlinear distortion of the output signal, and achieve the effects of small dependence, system stability, and accurate correction effect.

Active Publication Date: 2016-08-24
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0004] Therefore, because the RF power amplifier itself is a nonlinear device and the thermal memory effect of the RF power amplifier, the output signal of the RF power amplifier has a large nonlinear distortion. In order to ensure the quality of the magnetic resonance image, the above nonlinear problems must be solved

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  • Method and system for nonlinear correction of power amplifier

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[0033] will refer to Attached picture Each embodiment is described in detail. where possible, the same Attached picture mark will run through Attached picture Used to refer to the same or similar parts. For specific examples and Attached References made are for illustrative purposes and are not intended to limit the scope of the invention or the claims. The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as superior or superior to other implementations.

[0034] The present invention addresses the above and other non-linear problems of the prior art related to magnetic resonance RF power amplifiers, and proposes a method and system for stabilizing the amplifiers. The present invention includes at least one or any combination of the following features: digital signal input is used; nonlinearity of the power amplifier is corrected in the dig...

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Abstract

The invention relates to a method and a system for nonlinear correction of a radio frequency power amplifier. The method comprises the following steps of: S1. carrying out negative feedback correction on an input signal according to a feedback signal and outputting a negative feedback signal; S2. carrying out pre-distortion correction on the negative feedback signal and outputting the signal subjected to pre-distortion to the radio frequency power amplifier; and S3. collecting the signal amplified through the radio frequency power amplifier, generating the feedback signal and returning to the step S1. The method and the system for nonlinear correction of the radio frequency power amplifier adopt a method of combining the pre-distortion correction and closed-loop negative feedback correction, and are realized in a digital domain; and in comparison with a conventional nonlinear correction method, the correction effect is more accurate, the dependence on a device is smaller and the system is more stable.

Description

technical field [0001] The present invention generally relates to power amplifiers, in particular to a nonlinear correction method and a correction system for nuclear magnetic resonance radio frequency power amplifiers. Background technique [0002] In the magnetic resonance system, the RF power amplifier mainly amplifies the input small signal into a high-power RF signal, which is provided to the RF coil to generate RF excitation for imaging. In order to obtain high-quality magnetic resonance images, the magnetic resonance system requires that the radio frequency has good linearity in a large dynamic range. However, the RF power amplifier itself is a nonlinear device, and the output signal has a large nonlinear distortion, which is specifically manifested in that the gain and phase of the RF power amplifier change with the change of the signal input power. Therefore, it is necessary to take measures to deal with the nonlinearity of RF power amplifiers. figure 1 and 2 The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/195H03F3/213
CPCH03F1/32H03F3/195H03F3/213
Inventor 胡贤龙封勇福王垠骐陈基锋
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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