ManyMicrochipcustomersaskusforhelpwhen
designingtheiroscillatorcircuits.Duetothegreatnum-
berofcombinationsofVDDandtemperatureranges,
crystalorresonator,loadingcapacitors,circuitlayout
andcircuitboardmaterials,itisnotpracticaltoprovide
acookbookprocessthatwouldworkwellforeveryone
orevenformostusers.However,therearemeasures
thatcanbeusedtodevelopandtestforgoodworking
oscillatorcircuits.
Thisapplicationnotebreaksdowntheoscillatordesign
processintothefollowingthreeparts:specifyingthe
operatingconditions,selectingthecomponentsand
testingoscillatorperformance.Otherconcernsarealso
discussedthatmaybehelpfulduringlayoutand
testing.AN949MakingYourOscillatorWorkTemperatureAuthor:BrettDuaneTheproductisexpectedtooperateoversometemper-MicrochipTechnologyInc.aturerange.Testingofoscillatoroperationwillbeconductedoverthesameorslightlylargerrange.Thetemperatureaffectstransistorgain,capacitorvaluesINTRODUCTIONandthecrystal/resonatorfrequency.ManyMic
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