a programmable 210uv offset rail-to-rail gm-c filter

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1、1636IEEETRANSACTIONSONCIRCUITSANDSYSTEMSI:REGULARPAPERS,VOL.54,NO.8,AUGUST2007AProgrammable210-VOffsetRail-to-RailGmCFilterH.PooyaForghani-Zadeh,StudentMember,IEEE,andGabrielA.Rincón-Mora,SeniorMember,IEEEAbstract—Lowinput-referredoffsetperformanceandlinearityinanalogfiltersarecriticaldesi

2、gnparameters,yettransistormismatchlimitationsareaseverehindrance.Programmabilityisalsoafeatureofgrowingsignificancebecausehighperformancestate-of-the-artsystemsmustadapton-the-flytovariousoper-atingconditions,asisthecaseinbattery-operatedelectronicswheresystemstraversethroughidle,alert,andhi

3、ghperformancemodesinanefforttoconserveenergyandextendbatterylife.Thispaperpresentsacontinuousandprogrammablefirst-order–filterwithsub-millivoltoffsetperformance.Lowoffsetisachievedbyauto-zeroingandcontinuitybyping-pongingbetweentwotransconductors,allundertheconstructofacompactandbandwidth-ef

4、ficientcircuittopology.Theproposed–circuitwasfabricatedwithAMI’s0.5-mCMOSprocesstechnologyandachievedaninput-referredoffsetoflessthan210V,hand-overglitchesoflessthan40mV,and57dBoflinearityovertheFig.1.ProgrammableandcontinuouslowoffsetGCfilterforcurrentrail-to-railinputspanforalithium-ionbat

5、terysupplyrangeof3sensinginswitchingsupplyapplications.to4.2V.Thebandwidthandgainofthefilterwereprogrammablefrom1.1to6.5kHzand1.27to29.1V/V,respectively,bothwithbetterthan3.2%resolution.mayinadvertentlytriggerunexpectedtransitionsandthereforedegradethenoiseandjitterperformanceoftheoverallsy

6、stem.IndexTerms—Auto-zero(AZ),currentsensing,–filter,lin-Tuningthegainandbandwidthofanalogfiltersisalsoearity,lowoffset,pingpong,programmable,rail-to-rail.increasinglyimportantinawiderangeofapplications,fromre-ceiverradio-frequency(RF)filters,wherethefiltersbandwidthI.INTRODUCTIONmustmatchthef

7、requencyofthereceivedsignaltodiscernthedesiredsignalfromnoise,toswitchingpowersupplycircuits,whereafilteristunedtoaccuratelysensetheinductorandOW-OFFSETperformanceinanalogfilterscanbeasthereforetheoutputcurrent.State-of-the-artcurrent-sensingLimportantastheirfre