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The MOSFET is a type of FET that works by electronically varying the width of a channel along which electrons flow. The width of the channel is controlled by the voltage on an electrode called the gate , which is located physically between the source and the drain and is insulated from the channel by an extremely thin layer of metal oxide.[[Image:dualgatemosfet.png|left]] The MOSFET is a type of FET that works by electronically varying the width of a channel along which electrons flow. The width of the channel is controlled by the voltage on an electrode called the gate , which is located physically between the source and the drain and is insulated from the channel by an extremely thin layer of metal oxide.MOSFET functional modes:The schematic symbol illustrated here is for the Dual Gate MOSFET. #depletion mode #enhancement modeMOSFET functional modes: depletion mode and enhancement mode. The mode corresponds to whether the transistor is in an ON state or an OFF state at zero gate–source voltage. The depletion mode MOSFET and the JFET are very similar. JFETs cannot be used as enhancement mode devices because if the gate is forward biased it will conduct like a forward biased diode. The most common use of the MOSFET in radio communication is for amplification. Modern solid state transceivers use the MOSFET for amplification in the final stage of a radio transceiver. The MOSFET provides current and voltage gain yielding an output current into an external load which exceeds the input current and an output voltage across that external load which exceeds the input voltage.[[File:mosfetchannls.png]]<BR>Illustration: The direction of the arrow indicates the type of channel material. Notice that the gate terminal is not connected to the channel as in a JFET. The most common use of the MOSFET in radio communication is for amplification and uses an enhancement mode FET. Modern solid state transceivers use the MOSFET for amplification in the final stage of a radio transceiver. The MOSFET provides current and voltage gain yielding an output current into an external load which exceeds the input current and an output voltage across that external load which exceeds the input voltage. [[File:MOSFET_RD70HVF1.jpg]]<BR>''An example of a MOSFET used as a PA or final state power amplifier:''Signal enters from the pre-amplifier stage into the MOSFET where the signal is amplified to approximately 50 watts using the MOSFET in the illustration.In ham radio the PA refers to a power amplifier which may or may not be the MOSFET type. Pill - A slang term for the MOSFET popularized by bootleg [[Citizen Band]] operators using illegal power amplification. A CB user may refer to a 100-watt pill when discussing a linear amplifier connected between his 4-watt CB radio and his antenna. However, the pill specifically refers to a linear amplifier of the transistor type and not of the vacuum tube type. The term is criticized for being the invention of someone lacking a background in electronics and thus making a visual comparison to the shape of the round MOSFET to medication, such as an aspirin pill. [[File:transistor_pill.jpg]]<BR>''It is incorrect to refer to a transistor as a pill.'' [[Category:Electronics]][[Category:Electronic Components]]