There are two main types of field-effect transistors: Junction FET (JFET) and Metal-Oxide Semiconductor FET (MOSFET). Field-Effect Transistorsįield-effect transistors are the transistors that work with the field-effect principle of semiconductors. ![]() The emitter junction must be forward-biased, and the collector junction must be reverse-biased. The impurity concentration in the emitter region should be much greater than that in the base region, and the thickness of the base region must be small. In order to ensure this transmission process, two conditions should be satisfied: The amplification effect of BJT mainly relies on the transmission of the emitter current from the base region to the collector region. PNP schematic symbol (a), layout (b), NPN schematic symbol (c), layout (d) The collector is led from the collector region, the emitter is led from the emitter region, and the base is led from the base region (in the middle). Three poles are led out externally, which are the collector, emitter, and base. ![]() There are two combined structures, PNP and NPN. Here, "Bipolar" means that both the electron and holes participate in the movement at the same time when they're working. Bipolar Junction Transistors (BJT)īipolar Junction Transistor (BJT) is a device that combines two PN junctions through a certain process. The following mainly discuss the bipolar transistors, field-effect transistors, and some other typical types of transistors. The three terminals of a bipolar transistor are an emitter, a base, and a collector composed of N-type and P-type semiconductors The three terminals of the field-effect transistor are the source, the gate, and the drain. Three-terminal transistors are mainly divided into two categories: bipolar junction transistora>s (BJT) and field-effect transistors(FET). Strictly speaking, a transistor refers to all single components based on semiconductor materials, including diodes (two terminals), transistors, field-effect transistors, thyristors (the latter three are of three terminals). II Representative Types of TransistorsĪ semiconductor transistor is a semiconductor device that usually contains two PN junctions inside and three extraction electrodes outside. Transistors can be divided into low-noise amplifier transistors, medium and high-frequency amplifier transistors, low-frequency amplifier transistors, switching transistors, Darlington transistors, high-voltage transistors, band-stop transistors, damping transistors, microwave transistors, phototransistors, and magnetic transistors. In the light of the package structure, transistors can be classified into metallic packaging transistors, plastic packaging transistors, glass packaging transistors, surface-mounted transistors, and ceramic packaging transistors. ![]() Transistors can be divided into three groups: small power transistors, medium power transistors, and high power transistors based on their current capacity.Īccording to the operating frequency, there are low-frequency transistors, high-frequency transistors, and ultra-high-frequency transistors. There are diffuse-type transistors, alloy type transistors, and planar type transistors according to the manufacturing process of the transistors. And according to the polarity, the two types of transistors can be subdivided into germanium NPN type transistor, germanium PNP transistor, silicon NPN type transistor, and silicon PNP type transistor. Transistors can be divided into silicon transistors and germanium transistors based on semiconductor materials. Three-terminal transistors are mainly divided into two categories: bipolar transistors (BJT) and field-effect transistors( FET ). Strictly speaking, a transistor refers to all single components based on semiconductor materials, including diodes (two terminals), transistors, field-effect transistors, thyristors (the latter three are of three terminals). Detection of High-Power Darlington Transistor Detection of Ordinary Darlington TransistorĢ.
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