Transcription of 8. MOS Transistors, CMOS Logic Circuits
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8. MOS Transistors, CMOS Logic Circuits
M. Horowitz, J. Plummer, R. Howe1E40 MMOS Transistors, CMOS Logic Circuits ,and Cheap, Powerful ComputersM. Horowitz, J. Plummer, R. Howe2 Reading Chapter 4 in the reader For more details look at A& Signals (goes in much more detail than we need) A& DevicesM. Horowitz, J. Plummer, R. Howe3 MOSFET MOS Transistor Are very interesting devices Come in two flavors pMOSand nMOS Symbols and equivalent Circuits shown below Gate terminal takes no current (at least no DC current) The gate voltage*controls whether the switch is ON or OFFpMOSnMOSR ongategate* actually, the gate to source voltage, VGSM. Horowitz, J. Plummer, R. Howe4nMOSi-V Characteristics nMOSis still a device Defined by its relationship between current and voltage But it has 3 terminals! Current only flows between the source and drain No current flows into the gate terminal!VDSiDSGDSviRemember the resistor?M. Horowitz, J. Plummer, R. Howe5 SimpleModel of an nMOSD evice We will model an nMOSdevice by components we know Resistor Switch NMOSS ource = GndGate = Gnd=> OffGate = Vdd=> On This really simple model issuitable for applications wherethere s one value of On Horowitz, J.
M. Horowitz, J. Plummer, R. Howe 12 MOSTransistor Summary • MOS transistors are extremelyusefuldevices –Almost all of your electronics usesthem on the inside –Including your phone, laptop, WiFiand Bluetooth, and your
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