1.引言金属陶瓷四极管由于功率增益高等优越性,已广泛应用于近代大功率广播发射机。四极管由于帘栅隔离作用,跨路电容C_(ag1)(屏极与控制栅的极间电容)要比三极管小得多,大功率系列四极管C_(ag1)一般在1.5～10微微法,而三极管则为30～100微微法。但是,由于四极 1. Introduction Due to the advantages of high power gain, the cermet has been widely used in modern high-power broadcast transmitters. Due to the function of the screen, the cross-circuit capacitor C_ (ag1) (the inter-electrode capacitance of the screen and the control gate) is much smaller than that of the triode. The high-power series transistor C_ (ag1) is generally 1.5 to 10 picoseconds France, while the transistor is 30 to 100 pico-law. However, due to the quadrupole