Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please...
Transcript of Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please...
![Page 1: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/1.jpg)
Opera&onAmplifiers(OpAmps)
• Ac&vedevice,capableofprovidingvoltagegain
• Withproperconfigura&on,canimplementsumming,subtrac&on,integra&ononinputsignals
• Usedinnearlyeveryelectronicdevice
• Nearlyalwaysusedinafeedbackconfigura&on
+Differen&alinputs -
Single-endedOutput
V(+)
V(-)Vo
Feedback Network
i(+)
i(-)
• Wewilltreatthisdeviceasabuilding“block”withspecific(ideal)aJributesknownastheGOLDENRULESofOp-amps:
- Infiniteinputimpedanceonthe+and–terminalsi(+)=i(-)=0.
- VochangessothatV(+)=V(-)atall&mes…thismeanstheop-ampsourcesorsinkscurrentattheoutputterminalthroughthefeedbacknetworksothatV(+)=V(-).
![Page 2: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/2.jpg)
Exampleofcircuitanalysiswithop-amps
Vout
RfRG
Vin
+15
-15
![Page 3: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/3.jpg)
![Page 4: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/4.jpg)
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp…Nowconsider:
Vout
Rf
RG
Vin
1. Usingouridealop-ampcharacteris&csfindanexpressionforVout/Vin
2. Whatopera&ondoesthisop-ampconfigura&onperform?
3. List(atleast3)possibledevia&onsfromtheidealop-ampmodelandhowthosedevia&onsaffectyourresultfromexpression1.
+15
-15
ENPH259GroupAc&vi&esforOct52017
![Page 5: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/5.jpg)
Vout
Rf
RG
Vin
1. Usingouridealop-ampcharacteris&csfindanexpressionforVout/Vin
+15
-15
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp
ENPH259GroupAc&vi&esforOct52017
![Page 6: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/6.jpg)
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp
ENPH259GroupAc&vi&esforOct52017
![Page 7: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/7.jpg)
…Nowconsider:
Vout
Rf
RG
Vin
2. Whatopera&ondoesthisop-ampconfigura&onperform?
+15
-15
Actslikeanon-inver&ngamplifierwithgain>1
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp
ENPH259GroupAc&vi&esforOct52017
![Page 8: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/8.jpg)
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandandEmilyorDavidwillcometohelp
Vout
Rf
RG
Vin
3. List(atleast3)possibledevia&onsfromtheidealop-ampmodelandhowthosedevia&onsaffectyourresultfromexpression1.
-15
Gainischanged
Gainischanged
ENPH259GroupAc&vi&esforOct82015PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp
ENPH259GroupAc&vi&esforOct52017
+15
![Page 9: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/9.jpg)
Vout
Rf
RG
Vin
+15
-15
3. List(atleast3)possibledevia&onsfromtheidealop-ampmodelandhowthosedevia&onsaffectyourresultfromexpression1.
PleasecompletetheseexercisesonyourOWNpieceofpaper.Ifyouhaveques&onstalkwithyourgroupmatesorraiseyourhandDavidwillcometohelp
ENPH259GroupAc&vi&esforOct52017
15
![Page 10: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/10.jpg)
Vout
RFRG
Vin
+15
-15
G =Vout
Vin
= �RF
RG
Twoofthemostimportantnon-idealaspectsofop-ampsare:
• Thegainisnotinfinite
• Themaximumgainwhichcanbeproducedisafunc&onoffrequency.Inotherwords,GdependsondrivefrequencyofVin
![Page 11: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/11.jpg)
![Page 12: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/12.jpg)
Hereisanexampleofanon-idealmodelofanOpAmpusingavoltage-dependentvoltagesource.
TheOpAmpcan’tmakeVoutarbitrarilylargebecauseAisnotinfinite.ThismeanstherewillalwaysbeasmallVd.
![Page 13: Feedback - UBC Physics & Astronomy | UBC Physics & Astronomyenph259/2017-18Term1/... · Please complete these exercises on your OWN piece of paper. If you have ques&ons talk with](https://reader034.fdocuments.us/reader034/viewer/2022050522/5fa58bac26d00a184f65351f/html5/thumbnails/13.jpg)
StartonPrelabfornextweekENPH259GroupAc&vi&esforOct52017