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Single-StageAmplifiers
overview
Studylow-frequencybehaviorofsingle-stageCMOSamplifiers
luding:
Common-source
Sourcefollower
Common-gate
Cascodeconfigurations
Developintuitive(直观的)techniquesandmodelsusefulin
understandingcomplexsystems.
Useproperapproximationssoastocreateasimplemental
pictureofacomplicatedcircuit,andmakesitpossibleto
formulatethebehaviorofmostcircuitsbyinspectionrather
thanbylengthycalculations.
Single-StageAmplifiers
Basicconcepts(1)
Theinput-outputcharacteristicsofanamplifierisa
nonlinearfunction(Taylorexpansion,泰勒展开):
y(t)+x(t)+x(t)+
012n
Forsmallrangeofx,abovefunctioncanbesimplifiedas:
y(t)+x(t)
01
Wherecanbeconsideredthebiaspoint(偏置)and
01
thesmall-signalgain(小信号增益)
Single-StageAmplifiers
Basicconcepts(2)
Forsmallsignalrementx,ifwehave:
yx
1
Wecallthisamplifieralinearamplifier
Infact,duetothenoiseanddistortic.,theamplifieris
usuallynotexactlyalinearamplifier.Soweuseaconceptof
“Linearity”torevealhowthisamplifierismoreclosetoa
linearamplifier.
Single-StageAmplifiers
Basicconcepts(3)
BesidesLinearity,therearesomeotherfiguresneededtobe
consideredwhenwedesignanogintegratedcircuit.
Belowisan“ogdesignoctagon(八边形规则)”to
showtheogdesigncompromise(折衷):
Single-StageAmplifiers
common-source(共源)withresistiveload
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