Ebers moll model is one of classical models of bjt for small signals. The bipolar junction transistor can be considered essentially as two pn junctions placed backtoback. Bipolar junction transistors bjt general configuration and definitions the transistor is the main building block element of electronics. Fieldeffect transistor fet also known as unipolar transistor, is a threeended three electrodes, voltagecontrolled semiconductor electronic component that has the ability to amplify the electrical signal. A unijunction transistor ujt is a threelead electronic semiconductor device with only one junction that acts exclusively as an electrically controlled switch. Transistor bipolar bipolar junction transistor bjt unipolar field effect transistor fet dibandingkan dengan fet, bjt dapat memberikan penguatan yang jauh lebih besar tanggapan frekuensi yang lebih lebar. Ujt is a three terminal semiconductor switching device. In this article, basic overview of ujt along with working, construction, characteristics and its application as relaxation oscillator has been. As the name indicates, it has only one pn junction i. Unijunction transistor ujt construction, working, characteristics. This model is based on interacting diode junctions and is applicable to any transistor operating modes option a. A selection of typical bipolar junction transistors bjts is shown in fig 3. Bab 4 bipolar junction transistor bjt mohamad ramdhani. It is a semiconductor device and it comes in two general types.
Bipolar junction transistor bjt basics gate problems. Fet family consists of a group of several types of different components, whose common feature is the indirect effect of the electric field on the. In spite of having transistor added to its name, a unijunction transistor ujt working and characteristic curve varies completely from other counterparts. The invention of the bipolar junction transistor in 1948 was the beginning of semiconductor electronics. Semiconductors module 3 bipolar junction transistors semiconductors module 3 pdf 2 e. Unijunction transistor applications the most common application of a unijunction transistor is as a triggering device for scr and triac but other ujt applications include sawtoothed generators, simple oscillators, phase control, and timing circuits.
411 1312 919 585 544 1597 676 899 1070 1299 1350 827 101 1395 1345 1048 64 1298 613 386 317 736 1651 351 1557 202 1069 1511 383 1146 291 756 1376 392 785 1084 172 1203