一、前言PIN二极管是硅双扩散结由本征Ⅰ层分隔为P区和N区的一种器件,它在微波频段的行为,犹如一个电控可变电阻,外控偏压控制它的载流子浓度,使得它的阻抗随正向偏流变化而变化,变化范围可从几千欧到1欧或更小。利用PIN二极管的这种电导调制效应,就可做成各种电控装置,如开关、调制器、限幅器、电控衰减器等。采用PIN二极管调制器,调制信号不直接加到微波管上,而是加到振荡器的输出 I. INTRODUCTION PIN diode is a silicon dual diffusion junction separated by the intrinsic layer Ⅰ P and N region of a device, which acts in the microwave frequency band, like an electrically controlled variable resistor, external bias control its current carrying Sub-concentration, making it the impedance changes with the forward bias changes, ranging from thousands of Europe to 1 Europe or less. The use of PIN diode conductivity modulation effect, you can make a variety of electronic control devices, such as switches, modulators, limiters, electronic attenuators and so on. Using PIN diode modulator, the modulation signal is not directly added to the microwave tube, but added to the oscillator output