ECE 3040 - Dr. Alan DoolittleGeorgia TechLecture 12MOS Field Effect Devices How do they work? (math included for completeness but skipped in lectures as this should be a review of ECE 3040 material – Needed for advanced FET Device discussion)Reading: (Cont’d) Notes and Anderson2Chapter 7
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ECE 3040 - Dr. Alan DoolittleGeorgia TechMOS CapacitorMetal “Gate”InsulatorSemiconductor“MOS” = Metal- Oxide- Semiconductor“MOS” actually refers to “Metal”– Silicon Dioxide – SiliconOther material systems have similar “MIS” structures formed by Metal –Insulator – SemiconductorThe capacitor itself forms the basis of digital logic circuits, and DRAM storage units (storing charge) or can simply supply a capacitance for an analog integrated circuit. It will also be the building block for the most common transistor produced – the MOS transistor.The substrate is normally taken to be grounded and the “Gate” electrode can be biased with a voltage, VG