Transcription of EE105 –Fall 2015 Microelectronic Devices and Circuits
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EE105 –Fall 2015 Microelectronic Devices and Circuits
EE105 fall 2015 Microelectronic Devices and CircuitsMulti- Stage AmplifiersProf. Ming C. Wu Sutardja Dai Hall (SDH)Terminal Gain and I/O Resistances of MOS AmplifiersAV,t= gmRL1+gmRSRi= Ro=ro1+gmRE()#$%&AI,t= Without dege ne ration:Simpl y set RS=0AV,t=RL1gm+RLRi= Ro=1gmAI,t= AV,t=gmRLRi=1gmRo=ro1+gmRE()!"#$AI,t 1 For the gain, Ri, Roof the whole amplifier, you need to include voltage/current dividers at input and output stagesCommon Source(CS)Common Drain (CD)Common Gate (CG)Summary of MOS single - Transistor AmplifiersMOSC ommon SourceCommon Sourcewith DrainCommon GateRi SmallRoLargeVery LargeSmallLargeAVModerateSmall~ 1 ModeratefHSmallModerateLargeLargeSingle Stage Amplifier Cannot Meet All Requirements For example, a general purpose operational amplifier requires High input resistance ~ 1M Low output resistance ~ 100 High voltage gain ~ 100,000 No single transistor amplifier can satisfy all spec s Cascading multiple stages of amplifiers offers a path towards th
Summary of MOS Single-Transistor Amplifiers MOS Common Source Common Source with Deg. Common Drain Common Gate Ri ∞ ∞ ∞ Small Ro Large Very Large Small Large
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