Research on voltage overshoot of GaAs power amplifier in pulse system
Lu Miao,,Chen Hao,,Xu Yiming
(China Electronics Technology Group Corporation No.58 Research Institute, Wuxi 214035,,China)
Abstract: Due to the high output power of GaAs power amplifier, it is usually used in radar system and other communication systems with pulse system. According to the characteristics of GaAs power amplifier material, its breakdown field strength is low, and under the drain pulse modulation, when the pulse disappears, the current mutation will form voltage overshoot. When the overshoot voltage is high, it is easy to break down the amplifier. In this paper, the generation mechanism of voltage overshoot is introduced, and several measures to improve voltage overshoot are put through theoretical analysis, and the effectiveness of which is verified by actual measurement in GaAs power amplifier.
Key words : radar,;power amplifier;pulse,;overshoot