Transcription of Field Effect Transistors in Theory and Practice ...
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Field Effect Transistors in Theory and Practice ...
AN211A1RF Application InformationFreescale SemiconductorField Effect Transistors in Theoryand PracticeINTRODUCTIONT here are two types of Field - Effect Transistors , the JunctionField- Effect Transistor (JFET) and the Metal-OxideSemiconductor Field - Effect Transistor (MOSFET), orInsulated-Gate Field - Effect Transistor (IGFET). Theprinciples on which these devices operate (current controlledby an electric Field ) are very similar the primary differencebeing in the methods by which the control element is difference, however, results in a considerable differencein device characteristics and necessitates variances in circuitdesign, which are discussed in this JFETP- channel JFETDRAINGATESOURCEJUNCTION Field - Effect TRANSISTOR (JFET)In its simplest form the junction Field - Effect transistor startswith nothing more than a bar of doped silicon that behavesas a resistor (Figure 1a).
reversed and the channel begins to deplete of carriers as seen in Figure 8. As with the JFET, drain-current flow depletes the channel area nearest the drain first. The structure of Figure 7, therefore, is both a depletion-mode and an enhancement-mode device. MODES OF OPERATION There are two basic modes of operation of FET’s — depletion and ...
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