Download free jfet10/31/2023 ![]() As with bipolar transistors, I believe the best way to introduce field-effect transistor usage is to avoid theory whenever possible and concentrate instead on operational characteristics. The reasons for this have to do with obscure details of semiconductor theory, which I’d rather not discuss in this chapter. Generally, N-channel JFETs are more commonly used than P-channel. P-type channel JFETs are also manufactured: In the image just shown, this channel is an N-type semiconductor. ![]() Note how the current does not have to cross through a PN junction on its way between source and drain: the path (called a channel) is an uninterrupted block of semiconductor material. The controlling voltage is applied between the gate and source. In a junction field-effect transistor or JFET, the controlled current passes from source to drain, or from drain to source as the case may be. This becomes more evident when a physical diagram of the device is seen: That is, the main current through them is comprised either of electrons through an N-type semiconductor or holes through a P-type semiconductor. In the next chapter, we’ll explore another type of field-effect transistor, the insulated gate variety.Īll field-effect transistors are unipolar rather than bipolar devices. In this chapter, we’ll introduce the general concept of the field-effect transistor-a device utilizing a small voltage to control current-and then focus on one particular type: the junction field-effect transistor. In the last chapter, we studied bipolar transistors, which utilize a small current to control a large current. Transistors may be roughly grouped into two major divisions: bipolar and field-effect. \)Ī transistor is a linear semiconductor device that controls current with the application of a lower-power electrical signal.
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