| High power linear amplifiers are the key components of satellite communications, wireless communications, high capacity numeral microwave communications, CATV, WLAN and other communication systems. And high efficiency and linearization are the main requires of the communication systems to the power amplifiers. Most of the power amplifiers using in the military systems today are importations and the army needs the homemade linear power amplifiers urgently.In this paper, we considered both efficiency and linearization, and take the scheme of self-reaction control module and feed-forward technologies to improve the high power amplifier's linearity. Because of the self-control system, the linearization power amplifier system can work steadily in defiance of the changing of temperature and time. It makes the system more practicably and expends the use of the linearization system.The effect of harmonious impedance matching of power amplifier has been researched, the efficiency and IMD3 have a 0.5% and 1dB improvement respectively.Results are given for a series of two-tones inter-modulation distortion measurements and the IMD3 is -54dBc. It is shown that a 22dB improvement in the inter-modulation margin can be achieved when the amplifier's output is 43dBm. And the efficiency of the whole system is 18%. |
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