![]() ![]() 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. Transistor ratings and packages - PENDINGĪ transistor is a linear semiconductor device that controls current with the application of a lower-power electrical signal.Lessons In Electric Circuits - Volume III Chapter 5 JUNCTION FIELD-EFFECT TRANSISTORS Lessons In Electric Circuits - Volume III (Semiconductors) - Chapter 5 ![]()
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