Download P14345 Hardware Test Procedure

P14345HardwareTestProcedure
1 Introduction Thescopeofthisdocumentistooutlinetheproceduresusedintesting,verification,
andvalidationoftheHybridAudioDynamicsProcessor.Thisdocumentwillprovide
guidesandmethodsusedintesting.Usersshouldcontinuetoupdatethedocument
asportionsaretestedandthesystemsareanalyzed.
2 Hardware Sub‐System Testing 2.1 Input Section Testing Thistestconfirmsthatthedifferenceampisfunctioningasdesigned.
 Populateallcomponentsintheinputsection,exceptforthe0Ohmjumperon
theoutput.
 Checkforshortsbetweenpowerandground.
 Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
theChannel1non‐invertinginput.Useanoscilloscopetocomparetheinput
totheoutput,theyshouldbeidentical.
 Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
theChannel1invertinginput.Useanoscilloscopetocomparetheinputto
theoutput,theyshouldbephaseshifted180degrees.
 Generatea1VPP1kHzsinewaveandusethebalancingtestboardtocreate
thesinglesidedsignalintoadifferentialsignal.Thedifferentialsignals
shouldmeasure1VPPeach.ApplythosesignalstotheChannel1invertingand
non‐invertinginputs.Measuretheoutput,itshouldbe2VPP.
 RepeatforChannel2.
2.2 Precision Rectifier Testing 


Populateallcomponentsintheprecisionrectifiersection,exceptforthe0
Ohmjumperontheoutput.
Checkforshortsbetweenpowerandground.
Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
CH1_RECT_IN.


Useanoscilloscopetocompareinputvs.theoutput.Theoutputshouldbea
rectifiedcopyoftheinput.Observerectifiedzerocrossingincidentsfor
distortion.
RepeatforCH2_RECT_IN.
2.3 Low Pass Filter Testing 





PopulateallcomponentsintheLPFsection,exceptforthe0Ohmjumperon
theoutput.
Checkforshortsbetweenpowerandground.
SetupuptheoscilloscopetoperformanFFT.
ConnectOscilloscopeChannel1toLPF_IN_1andChannel2toLPF_OUT_1,
performtheFFT.
Comparethefrequencyresponseofthefilteragainstthedesignparameters.
RepeatthesameprocedureforLFP_IN_2andLPF_OUT_2.
2.4 Output Stage Testing 





Populateallcomponentsintheoutputstagetesting.
Checkforshortsbetweenpowerandground.
Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
CH1_LN_DVR_IN.
WithanOscilloscope,observetheinputandthe+_OUT,theyshouldbe
identical.
WithanOscilloscope,observetheinputandthe‐_OUT,theyshouldbe180
degreesoutofphase.
RepeatwithCH2_LN_DVR_IN.
2.5 VCA Section Testing Therearemultipletestsforthesectionandtheyarealittlemoreinvolvedthanthe
previoussections.Thefirsttestistoconfirmthebuildiscorrectandthatcontrol
voltagesarecorrect.
 PopulateallcomponentsintheVCAsection,exceptforthe0Ohmjumperon
theoutputANDtheVCAsANDR108‐R111.
 Checkforshortsbetweenpowerandground.
 PopulateR47‐R49intheMCUsection.
 Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
U11.29&U11.30
 CheckthevoltagesatR109andR111,itshouldbe0.045VPP
 TurnRV1andRV2untilthevoltageatU4.4&U4.5is0.1V+/‐0.05V.
Thenexttesttoconfirmthatthegainconstantis‐6.1mv/dB.
 PopulateU4,R108,andR109.
 Checkforshortsbetweenpowerandground.
 Apply400mVtoU11.29&U11.30.
 Generatea1VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
CH1_VCA_IN.MeasureCH1_VCA_OUTagainstCH1_VCA_IN,thereshouldbe
3dBofgainreduction.
2.6 MCU Testing 



PopulateallcomponentsintheMCUsection.
Checkforshortsbetweenpowerandground.
Loadcode.
PerformSoftwareTestingtoverifyhardware
3 Hardware Performance Testing 3.1 Common Mode Rejection Testing 
Generatea10VPP1kHzsinewaveusingthefunctiongeneratorandapplyitto
CH1‐andCH1+.Usingtheoscilloscopeandmeasuretheinputvs.theoutput
atthetestpoint.Usingthemathfunctionoftheoscilloscope,displaydB.The
magnitudeofCMRshouldbegreaterthat50dB.
3.2 Bandwidth Testing 



HooktheoutputofthenetworkanalyzertoinputsCH1‐/+.
HooktheinputsofthenetworkanalyzertotheoutputCH1‐/+.
Performafrequencysweepfrom1Hz‐200kHzandobtaintheBodeplot.
Comparethatdataagainstdesignrequirement.Targetrangeis20Hz–
20kHz.
3.3 Noise Testing 

Configureaprecisionop‐ampwithagainof100.
Withthesystemnotinbypassandnomake‐upgain,hookchanneloneoutput
totheprecisionop‐ampout.


Observetheop‐ampoutput.Determineiftheop‐ampispickingupthe
systemselfnoiseandthenamplifyingit.Determineifmoregainisneededto
getamoreaccuratereading.
DividetheRMSnoisesignalbythegaintodeterminetheself‐noiseand
compareittothedesignspecifications.
3.4 Distortion Test 
Consultwithotherengineersonthebestmethodofdoingthis.