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(5)场效应管与晶体三极管的比较: ①晶体三极管在正常放大工作状态,其发射结为正向偏置,输入端需要向信号源吸取电流,其输出电流的大小是与输入信号电流成正比,所以,晶体三极管实质上是电流(基极电流)控制元件,其输入电阻一般都比较低;而场效应管的输入端,有的是一个反向偏置的PN结(如结型),有的是绝缘层的两侧(如绝缘栅型),其输入端基本上不需要从信号源中吸取电流,只要求有电压的变化,即仅利用栅极电压的变化来控制漏极电流(晶体三极管集电极电流是由基极电流控制),因
(5) FET and transistor Transistor comparison: ① transistor in the normal working state, the emitter junction is forward biased, the input terminal needs to draw current to the signal source, the output current is the size of the input signal current Is proportional, so the transistor is essentially the current (base current) control element, the input resistance is generally relatively low; and FET input, some is a reverse-biased PN junction (such as junction), and some are Insulation on both sides (such as insulated gate type), the input terminal basically does not need to draw current from the signal source, only requires a change in voltage, that is, only the use of gate voltage changes to control the drain current (transistor set Electrode current is controlled by the base current)