Abstract
设计了一种有源射频模拟预失真器。利用小信号放大器的非线性输出信号作为功率放大器的预失真信号，经过对该非线性信号适当的相位和幅度调整后，将该预失真信号注入到主信号支路与原始信号一起作为功率放大器的驱动信号，产生了比较好的预失真效果。利用该预失真器对一个GSM基站功率放大器进行预失真测试，双音实测数据表明该预失真器使功放的三阶交调失真(IMD3)改善了12.2 dBc。 An analog RF active predistorter is designed. The nonlinear output signal of a small signal amplifier is used as the predistortion source of the power amplifier, the phase and the amplitude of the nonlinear signal is properly tuned, and it is injected to the main signal branch, the predistortion signal together with the original signal acted as the driver signal of the power amplifier, the predistortion effect is good. A GSM station power amplifier is predistorted by the designed predistorter is tested; two-tone test shows the IMD3 products of the power amplifier improved 12.2 dBc.
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