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--- glossary:glossary_m [2021/08/08 05:08] – updated the wikipedia link Wayne
+++ glossary:glossary_m [2021/08/11 11:02] – [MOSFET] WortingUK
@@ Line 50: / Line 50: @@
 ===== Monostable =====
 An electronic circuit that has a single (mono) stable state and an unstable state, an input will cause the circuit to assume the unstable state, when the input signal is removed and after a predictable delay the circuit will return to the stable state. This behaviour is the basis of most timer circuits.
-===== MOSFET =====
+===== MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor =====
+A MOSFET is a type of transistor with a Gate, Source and Drain terminals. [[wp>MOSFET|MOSFET]] \\
+ They are the dominant type of transistor in electronics and in chips.\\
+The resistance between Source and Drain (D-S) controlled by the Voltage applied across the Gate and Source.
+A Voltage across D-S causes a current to flow in the D-S resistance.\\
+There are several sub-types...\\
+ - N channel uses positive Voltages\\
+ - P channel uses negative Voltages \\
+ - Depletion mode uses increasing Gate Voltage to increase D-S resistance\\
+ - Enhancement mode uses decreasing Gate Voltage to decrease D-S resistance\\
+For MERG, the common type is N channel Enhancement mode.\\
+//Compapared to a Bipolar transistor, Gate = Base, Source = Emitter, Drain = Collector.//
-metal-oxide-semiconductor field-effect transistor [[wp>MOSFET|MOSFET]]
+The Gate exhibits a very high resistance (insulation) to the Source or Drain.\\
+There being an insulation, the Gate has some capacitance to the other pins and needs to be driven by a low impedance (AC resistance) input signal. A high impedance input signal will make the device slow. An open circuit Gate can build up a charge and results in the D-S going low resistance (turns 'ON').\\
 ===== MSAG =====