极性发射机供电调制中的畸变机理

2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems Pub Date : 2009-11-01 DOI:10.1109/COMCAS.2009.5386083

M. Alon, S. Singer, S. Spiegel

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引用次数: 2

摘要

分析了EDGE极性发射机中由PWM发生器引入的电源调制畸变机理、直流稳压器的频率响应以及高频恢复单元的有限带宽。结果表明，存在一个最佳调节器带宽，使PWM发生器产生的总剩余能量和降压变换器的低通滤波器特性最小化。分析了5MHz PWM时钟降压变换器的输出频谱。结果表明，为了满足EDGE传输掩码要求，对于300KHz转换器带宽，高频恢复单元的带宽要求至少为10MHz，而对于95KHz转换器带宽，高频时要求不进行补偿。

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Distortion mechanisms in supply modulation of polar transmitters

The distortion mechanisms in supply modulation introduced by the PWM generator, the frequency response of DC regulator and the limited bandwidth of the high frequency recovery unit are analyzed for EDGE polar transmitters. It is demonstrated that there is an optimum regulator bandwidth that minimizes the total residual energy originated from the PWM generator and the low pass filter characteristics of the buck converter. The output spectrum was analyzed for a 5MHz PWM clock frequency buck converter. The results show that in order to meet EDGE transmission mask requirements, the bandwidth requirements of the high frequency recovery unit should be at least 10MHz for 300KHz converter bandwidth while a 95KHz converter bandwidth demands for no compensation at high frequencies.

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来源期刊

2009 IEEE International Conference on Microwaves, Communications, Antennas and Electronics Systems

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