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glossary:glossary_m [2021/08/08 00:39] – [Modulation] Wayneglossary:glossary_m [2021/08/11 11:57] (current) – [Microprocessor] WortingUK
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 ===== Matrix ===== ===== Matrix =====
  
-[[http://en.wikipedia.org/wiki/Diode_matrix|Wikipedea article]]\\ +[[wp>Diode_matrix|Wikipedea's Matrix entry]]\\ 
 [[:helpsystem:matrix|Main article]] available to MERG Members only. [[:helpsystem:matrix|Main article]] available to MERG Members only.
  
 ===== Memory Wire ===== ===== Memory Wire =====
 Wire made from a special alloy which changes its molecular structure at a certain temperature causing it to shrink. This effect can usefully be applied to point and signal actuation. Some types require a tension spring to pull it back to its original length while others will return unaided, although a spring is still required to keep the wire tight, it can only pull when shrinking, it cannot push.\\  Wire made from a special alloy which changes its molecular structure at a certain temperature causing it to shrink. This effect can usefully be applied to point and signal actuation. Some types require a tension spring to pull it back to its original length while others will return unaided, although a spring is still required to keep the wire tight, it can only pull when shrinking, it cannot push.\\ 
-[[https://en.wikipedia.org/wiki/Shape-memory_alloy|Wikipedia article]]\\ +[[wp>Shape-memory_alloy|Wikipedia's entry]]\\ 
 See also TBs: [[http://www.merg.org.uk/merg_tbs/download.php?fileid=919&userid=62|G19/01]],  See also TBs: [[http://www.merg.org.uk/merg_tbs/download.php?fileid=919&userid=62|G19/01]], 
 [[https://www.merg.org.uk/merg_tbs/download.php?fileid=920|G19/02]],  [[https://www.merg.org.uk/merg_tbs/download.php?fileid=920|G19/02]], 
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 [[wp>Microprocessor|Microprocessor]] [[wp>Microprocessor|Microprocessor]]
  
 +microprocessor is a general-purpose name. Specialised devices:\\ 
 +A digital signal processor (DSP) is specialized for signal processing.\\ 
 +Graphics processing units (GPU) for rendering of images.\\ 
 +Microcontrollers integrate a microprocessor with peripheral devices in embedded systems..\\ 
 +System On Chip (SoC) often integrate one or more microprocessor cores with bus controllers.
 ===== Mobile decoder ===== ===== Mobile decoder =====
  
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 ===== Monostable ===== ===== 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. 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.\\ 
 +The resistance between Source and Drain (D-S) is 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 or P channel uses negative Voltages \\ 
 + - Depletion mode uses increasing Gate Voltage to increase D-S resistance or 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 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 ===== ===== MSAG =====
glossary/glossary_m.1628383183.txt.gz · Last modified: 2021/08/08 00:39 by Wayne

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