Current-ModeAnalogSignalProcessingCurrent-modecircuittechniquesisanalternativetoconventionalandswitchedcapacitorcircuitsforcontinuousandsampled-dataanalogsignal--July20,20051DalianInstituteofTechnology,ChinaYannHUWhyCurrent-Mode?Low-voltagemakesitdifficulttodesignvoltage-modecircuitswithhighlinearityandwidedynamicrangeCurrent-modecircuitscanoperatewithlowpower--modemeetstherequirementsofhigh-frequencyandhigh---signalICsJune20-July20,20052DalianInstituteofTechnology,parisonbetweenV-MandC-MVoltagemode:HighinputimpedanceLowoutputimpedanceCurrentmode:LowinputimpedanceHighoutputimpedanceJune20-July20,20053DalianInstituteofTechnology,urrent-modeCircuitsTransferfunction:Itcanperform3ofthefourbasicprocessingoperationsInvertScale(amplification)addM1M2IRkIRIOUT(W/L)k(W/L)Iin1Iin2June20-July20,20054DalianInstituteofTechnology,ChinaYannHUBasicSwitched--currentcircuit:(Track-and-hold)WithMS"on"thecircuittrackstheIin:WithMSturned"off"(W/L)k(W/L)Iin1Iin2MSClockJune20-July20,20055DalianInstituteofTechnology,I)(1)Firstgenerationcurrentconveyor:iY=iX→idealcurrentsourcedeterminedbyiX→infiniteimpedanceinY(opencircuit)vX=vY→idealvoltagesourcedeterminedbyvY→shortcircuitbetweenvXandvYiZ=±iX→idealcurrentsourcedeterminedbyiX→infiniteimpedanceinZ(IYXZiYiXiZvYvXvZJune20-July20,20056DalianInstituteofTechnology,I)(2)Equivalentscheme:AfictiveshortcircuitbetweenXandY(vX=vY)RealCMOScircuit:M1andM2matchedvX=vYM3andM5matchediZ=iXM3andM4matchediY=iXYXZnullatornoratoriYiXiXiXiZM2XYZM1M3M4M5iZiXiYJune20-July20,20057DalianInstituteofTechnology,I)(3)Example1:vX=vY,iX=iYR=-vX/iXRin=vY/iY=-RNegativeimpedanceExample2:vX=vYR=-vY/iYRin=vX/iX=-IYXZiYiXiZvYvXvZRRinJune20-Ju
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