Transcription of 19 - Talking Electronics
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19 - Talking Electronics
506 Principles of ElectronicsIn the previous chapters, we have discussed the cir-cuit applications of an ordinary transistor. In thistype of transistor, both holes and electrons play partin the conduction process. For this reason, it is some-times called a bipolar transistor. The ordinary or bipo-lar transistor has two principal disadvantages. First, ithas a low input impedance because of forward biasedemitter junction. Secondly, it has considerable noiselevel. Although low input impedance problem may beimproved by careful design and use of more than onetransistor, yet it is difficult to achieve input impedancemore than a few megaohms. The field effect transistor(FET) has, by virtue of its construction and biasing, largeinput impedance which may be more than 100megaohms.
Field Effect Transistors 507 ing managers to believe that this device will soon become the most important electronic device, primarily because of its integrated-circuit applications.
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