论文部分内容阅读
把一个n型沟道场效应管和一个npn型晶体管,连接成共射一共基极放大器。当改变供电电压时,场效应管的偏置从零变负,而晶体管的基极电流从零增到量大。可以看到,供电电压从零增加到满程时,首先,晶体管截止,而场效应管是负偏置,处于导通状态。供电电压增加到最大时则相反,此时场效应管被切断,而晶体管处于完全导通状态。因此,在零电压和最大电压时,通过线路的电流是零和最小。在电源电压的两个极端之间,电流首先是增加,
An n-channel FET and an npn-type transistor are connected as a common-emitter base-amplifier. When changing the supply voltage, the bias of the FET changes from zero to zero while the base current of the transistor increases from zero to a large amount. It can be seen that when the supply voltage increases from zero to full range, firstly, the transistor is turned off, and the FET is negative-biased and is in the on-state. On the other hand, when the supply voltage is increased to the maximum, the FET is cut off and the transistor is fully turned on. Therefore, at zero voltage and maximum voltage, the current through the line is zero and minimum. Between the two extremes of the supply voltage, the current increases first,