1.变容二极管结构、符号及外形在反向电压作用下的二极管处于截止状态,两边的P型和N型半导体相当于平板电容的两个极板,中间的耗尽层电阻很大,看作绝缘介质,所以反向电压作用下的二极管可看成一个电容(结电容),如图1所示。结电容Co容量随外加反向电压的变化 1. Varactor structure, symbol and shape Under the reverse voltage diode is in the off state, on both sides of the P-type and N-type semiconductor equivalent plate capacitor two plates, the middle of the depletion layer resistance is large, see For the insulating medium, so the reverse voltage diode can be seen as a capacitor (junction capacitance), as shown in Figure 1. Capacitance of junction capacitance changes with applied reverse voltage