Chapter_17外文.pdf

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1、Switched-capacitorfiltersWillySansenKULeuven,ESAT-MICASLeuven,Belgiumwilly.sansen@esat.kuleuven.beWillySansen10-05N171Switched-CapacitorFilters•Introduction:principle•Technology:•MOScapacitors•MOSTswitches•SCIntegrator•SCintegrator:Exacttransferfunction•Strayinsensitiveintegrator•BasicS

2、C-integratorbuildingblocks•SCFilters:LCladder/bi-quadraticsection•Opamprequirements•Chargetransferaccuracy•Noise•Switched-currentfiltersMcCreary,JSSCDec75,371-379Gregorian,IEEEProc.Aug83,941-986WillySansen10-05N172Principleφ1Iavφ2Tc=1/fcVVφ112φ2tCIIavtQQ2•NonoverlappingclocksQavC(V1-V2)

3、•SwitchesareMOSTsI==avT1TcTccR==(V1-V2)CfcCI=avRForC=1pF&f=100kHzR=10MΩcWillySansen10-05N173Low-PassFilterwithR’sandCCAvR1-RA2v0-20dB/decvIN+vOUT1ff-3dBR2Av0=Ratio’sofR:0.5%accuracyR11f-3db=AbsolutevalueofRC:20%accuracy2πR2CWillySansen10-05N174Low-PassFilterwithswitchedC’sCC12R1-R2C2v-I

4、N+v12OUTvINC+1vOUTC1Av0=Highaccuracy:onlyratio’sofC:0.2%C2Onlycapacitorstodrive:lowpower!fcC2Tunable&easytointegrate!f-3db=2πCBut:onlyforfrequencies<

5、slocSwitcheskOpampsWillySansen10-05N177Switched-CapacitorFilters•Introduction:principle•Technology:•MOScapacitors•MOSTswitches•SCIntegrator•SCintegrator:Exacttransferfunction•Strayinsensitiveintegrator•BasicSC-integratorbuildingblocks•SCFilters:LCladder/bi-quadraticsection•Opamprequirem

6、ents•Chargetransferaccuracy•Noise•Switched-currentfiltersMcCreary,JSSCDec75,371-379Gregorian,IEEEProc.Aug83,941-986WillySansen10-05N178Capacitors:metal-n+&Metal-polyC≈5fF/µm2C≈2fF/µm2areaarea2C≈1fF/µm2C≈1.2fF/µmppC/C≈1/2C/C≈1/4areapareap•Voltagedependent•Linear•Rsub:noise•Largeparasitic

7、s:Multi-layer!WillySansen10-05N179CapacitorMatchingConstantArea/Perimeter!Commoncentroidelay-out!WillySansen10-05N1710RandomError(σ)1%σ0.1%Log(C)localvsglobaltoxeffectsWillySansen10-05N1711CapacitancesinnanometerCMOSvias•MIMcapacitors•Digitaltechnology,noMIMcap.•5metallayers,0.