Voltage applied to the gate causes the substrate under the gate to “flip polarity”. That allows them to be used as radio “mixers” to multiply one signal by another.Į-MOSFETs In an enhancement-mode MOSFET, the drain is isolated from the source because the substrate is doped opposite the source and drain. Like JFETs, D-MOSFETs are used in the front ends of radio receivers because of their inherently low internal noise.ĭ-MOSFET AGC Amplifiers Since gm depends on the Q-point, MOSFETs are used for Automatic Gain Control in radio receiversĭ-MOSFET Mixers Unlike JFETs, D-MOSFETs can be built with two gates. In addition, a class-A MOSFET amplifier can work with VGS = 0.ĭ-MOSFET Amplifiers The equations for Zin, Zout and Av developed for JFET amplifiers can be used with D-MOSFET amplifiers. MOSFETs can be damaged by static electricityĭ-MOSFETs Similar to a JFET, but Zin of device is almost infiniteĭ-MOSFETs Unlike JFETs, D-MOSFETS can work with zero biasĭ-MOSFETs The same bias circuits used with JFETs can be used with E-MOSFETs.The metal gate of a MOSFET is isolated from the silicon channel by a thin layer of silicon oxide (SiO2, commonly known as glass) Unlike JFETs, MOSFETs can be manufactured as enhancement-mode (E-MOSFETs) as well as depletion-mode (D-MOSFETs).Like JFETs, MOSFETs come in N-channel and P-Channel types.MOSFET stand for Metal-Oxide-Semiconductor (or Metal-Oxide-Silicon) Field-Effect-Transistor.
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