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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >A look-up-table digital predistortion technique for high-voltage power amplifiers in ultrasonic applications
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A look-up-table digital predistortion technique for high-voltage power amplifiers in ultrasonic applications

机译：超声应用中用于高压功率放大器的查找表数字预失真技术

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摘要

In this paper, we present a digital predistortion technique to improve the linearity and power efficiency of a high-voltage class-AB power amplifier (PA) for ultrasound transmitters. The system is composed of a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and a field-programmable gate array (FPGA) in which the digital predistortion (DPD) algorithm is implemented. The DPD algorithm updates the error, which is the difference between the ideal signal and the attenuated distorted output signal, in the look-up table (LUT) memory during each cycle of a sinusoidal signal using the least-mean-square (LMS) algorithm. On the next signal cycle, the error data are used to equalize the signal with negative harmonic components to cancel the amplifier's nonlinear response. The algorithm also includes a linear interpolation method applied to the windowed sinusoidal signals for the B-mode and Doppler modes. The measurement test bench uses an arbitrary function generator as the DAC to generate the input signal, an oscilloscope as the ADC to capture the output waveform, and software to implement the DPD algorithm. The measurement results show that the proposed system is able to reduce the second-order harmonic distortion (HD2) by 20 dB and the third-order harmonic distortion (HD3) by 14.5 dB, while at the same time improving the power efficiency by 18%.
机译：在本文中，我们提出了一种数字预失真技术，以改善用于超声发射器的高压AB类功率放大器（PA）的线性度和功率效率。该系统由数模转换器（DAC），模数转换器（ADC）和现场可编程门阵列（FPGA）组成，其中实现了数字预失真（DPD）算法。 DPD算法使用最小均方（LMS）算法在正弦信号的每个周期内在查找表（LUT）存储器中更新误差，该误差是理想信号与衰减后的失真输出信号之间的差。在下一个信号周期，误差数据将用于均衡具有负谐波分量的信号，以消除放大器的非线性响应。该算法还包括应用于B模式和多普勒模式的加窗正弦信号的线性插值方法。测量测试台使用任意函数发生器作为DAC来生成输入信号，使用示波器作为ADC来捕获输出波形，并使用软件来实现DPD算法。测量结果表明，该系统能够将二次谐波失真（HD2）降低20 dB，将三次谐波失真（HD3）降低14.5 dB，同时将功率效率提高18％ 。

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