Why is noise input referred? - Electrical Engineering Stack ...

Input-referred noise is the noise voltage or current that, when applied to the input of the noiseless circuit, generates the same output noise ... ElectricalEngineeringStackExchangeisaquestionandanswersiteforelectronicsandelectricalengineeringprofessionals,students,andenthusiasts.Itonlytakesaminutetosignup. Signuptojointhiscommunity Anybodycanaskaquestion Anybodycananswer Thebestanswersarevotedupandrisetothetop Home Public Questions Tags Users Unanswered Teams StackOverflowforTeams –Collaborateandshareknowledgewithaprivategroup. CreateafreeTeam WhatisTeams? Teams CreatefreeTeam Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. Learnmore Whyisnoiseinputreferred? AskQuestion Asked 5years,11monthsago Active 3years,7monthsago Viewed 9ktimes 3 1 \$\begingroup\$ ManyofthetextbooksIhavereadanalyzenoisesignals.WehaveacircuitandfindtheoutputnoiseRMSvoltage.Butthereisalwaysthe"extra"stepoffindingtheinput-referrednoise.Whydoweneedtofindtheinput-referrednoise?HowdoesithelpusanymorethantheoutputnoiseRMSvoltage? noise Share Cite Follow askedMar10,2016at0:34 SonnySonny 6111silverbadge44bronzebadges \$\endgroup\$ 1 \$\begingroup\$ becauseifyouadjustthegainofanamplifier,theoutputnoisechanges,buttheinputreferrednoisedoesn't \$\endgroup\$ – endolith Jan19,2017at21:21 Addacomment  |  3Answers 3 Active Oldest Score 3 \$\begingroup\$ Inputreferrednoiseisusedtodeterminethenoisecontributionofthecircuitwhenitisusedinasystem.Itgivesausefulframeofreference.Acircuitwithalowerinputreferrednoisewillcontributelessnoisetooverallsystemthanonewithahigherinputreferrednoise. Share Cite Follow answeredMar10,2016at1:37 ChrisHansenChrisHansen 53133silverbadges77bronzebadges \$\endgroup\$ Addacomment  |  2 \$\begingroup\$ Input-referrednoiseisthenoisevoltageorcurrentthat,whenappliedto theinputofthenoiselesscircuit,generatesthesameoutputnoiseasthe actualcircuitdoes. http://www.seas.ucla.edu/brweb/teaching/215C_W2013/Noise.pdf Share Cite Follow answeredJul15,2018at9:55 GennaroArguzziGennaroArguzzi 45111goldbadge88silverbadges2323bronzebadges \$\endgroup\$ Addacomment  |  1 \$\begingroup\$ Input-referrednoiseisgenerallymoreusefulbecauseitrelatesdirectlytotheunalteredsignal.Youdon'thavetoknowanythingaboutthegainandothercharacteristicsoftheamplifierthissignalisconnectedtoinordertounderstandthenoiselevel. Putanotherwayinput-referrednoiseisthesameashavingaperfectamplifier,withallthenoisebeingoriginallyonthesignal. Share Cite Follow answeredJul15,2018at11:27 OlinLathropOlinLathrop 305k3636goldbadges411411silverbadges879879bronzebadges \$\endgroup\$ 1 \$\begingroup\$ Hello@OlinLathrop,ifpossible,canyousendmealinkofanop-ampdatasheetonwhichIcanfindinput-referrednoiseplease? \$\endgroup\$ – GennaroArguzzi Jul15,2018at15:31 Addacomment  |  YourAnswer ThanksforcontributingananswertoElectricalEngineeringStackExchange!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.UseMathJaxtoformatequations.MathJaxreference.Tolearnmore,seeourtipsonwritinggreatanswers. Draftsaved Draftdiscarded Signuporlogin SignupusingGoogle SignupusingFacebook SignupusingEmailandPassword Submit Postasaguest Name Email Required,butnevershown PostYourAnswer Discard Byclicking“PostYourAnswer”,youagreetoourtermsofservice,privacypolicyandcookiepolicy Nottheansweryou'relookingfor?Browseotherquestionstaggednoiseoraskyourownquestion. TheOverflowBlog SustainablearchitecturesinaworldofAgile,DevOps,andcloud DebuggingbestpracticesforRESTAPIconsumers FeaturedonMeta UpdateontheongoingDDoSattacksandblockingTorexitnodes WhatgoesintositesponsorshipsonSE? Related 4 Highinputimpedancedevices-inducednoisesensitive 2 Powersupplynoiseincircuits 1 Tradeoffbetweenlow-noiseandlow-powerdesign 1 Ιnputreferrednoiseofanamplifier 4 SampledNoiseAmplitude 2 OriginofincreasednoiseinBF862/OP27chargeamplifier 1 MaximumAllowableNoiseofADCInputSignal 1 HowcanIextractthermsnoisefromthemeasurement'soverallnoise? 0 Whatisthedifferencebetween"available"noisepowerandnoisepower? 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