为了满足新型雷达对发射系统日益提出的大功率、大工作比、长脉宽、小型化等多方面的要求,一种有效途径是将 LDMOS功率晶体管引入发射机中。而将以通信应用为目的研制的LDMOS功率管可靠地应用在大型相控阵中,需要做更 多的努力。文中从功率管失效机理分析入手,讨论了匹配电路设计、偏置电路设计、热设计、电磁兼容设计和接地设计对 工作可靠性的重要性,针对LDMOS大功率管的低频高增益和沟道大电流的特点,着重论述了偏置电路设计中抑制震荡和 冲击的方法。通过大量实验验证,文中固态功放表现出了很好的工作可靠性。该文对固态功放设计具有普遍指导作用, 为新器件在雷达发射机中的应用开拓了道路。

In order to satisfy the new-style radar's increasing requirements in transmitter's high power, high duty cycle, long pulse width, small size and so on, an effective way is to introduce LDMOS power transistor into transmitter's design. In large-scale phased-array system, we need to do more efforts in reliable application of LDMOS which is generally designed for communication. Starting with the analysis of power transistor's failure mechanism, the importance of matching circuit design, bias circuit design, cooling design, EMC design and grounding design is discussed in transistors' working reliability. Because of LDMOS' high gain in low frequency and large channel current, methods of restraining resonance and impulsion in bias design are discussed specially. In a great deal experiments, the solid-state power amplifier in paper takes on good working reliability. This paper can generally instruct the design of solid-state amplifier, and carves out the way for the use of new devices in radar transmitter.