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P-material becomes N-material as charge carriers are attracted into the region by the gate.Į-MOSFETs The key parameter for an E-MOSFET is the threshold voltage (VGS(TH)) required to turn it onĮ-MOSFET Switches The most common use for an E-MOSFET is switchingĮ-MOSFET Switches The IRF510 E-MOSFET is a typical power switch. 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.