Transcription of AN-263Sine Wave Generation Techniques - TI.com
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AN-263Sine Wave Generation Techniques - TI.com
ApplicationReportSNOA665C October1999 ,amplitude, Transformerin a anOvenandUsinga VaractorNetworkCanFineTunea October1999 RevisedApril2013AN-263 SineWaveGenerationTechniquesSubmitDocume ntationFeedbackCopyright 1999 2013, October1999 RevisedApril2013 SubmitDocumentationFeedbackCopyright 1999 2013, a significantdesignchallengebecausetheyrep resenta requiredin a numberofdiverseareas,includingaudiotesti ng,calibrationequipment,transducerdrives ,powerconditioningandautomatictestequipm ent(ATE).Controloffrequency,amplitudeord istortionlevelis oftenrequiredandallthreeparametersmustbe simultaneouslycontrolledin numberoftechniquesutilizingbothanalogand digitalapproachesareavailablefora (seeTable1).2 PhaseShiftOscillatorA simpleinexpensiveamplitudestabilizedphas eshiftsinewaveoscillatorwhichrequiresone ICpackage,threetransistorsandrunsoffa singlesupplyappearsin Figure1. Q2,in combinationwiththeRCnetworkcomprisesa 'scollectoris fedtotheinputoftheLM386viathe10 combinationwiththeinternal50k unitin theLM386dividesQ2' necessarybecausetheLM386hasa unitygaincurrentbufferwhichwilldrivean8 the5 F ' ,Q3performsa comparisonfunctionanditscollectorcurrent modulatesQ1' ,anemitterfollower, theemitterofQ2is openedupanddrivenbya controlvoltage, ( )peak-to-peakinto8 withabout2% 3 Vpowersupplyvariationcauseslessthan Vp-ptothe8 loadwithabout2%
www.ti.com Introduction 1 Introduction Producing and manipulating the sine wave function is a common problem encountered by circuit designers. Sine wave circuits pose a significant design challenge because they represent a constantly
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