cf kwong2016秋季大三学术session.pdfVIP

H62ECP–ELECTRONICCONSTRUCTIONPROJECT

SpecificguidelinesandtasksforSession2

BasedontheschematicsimulationmodelthatyoudevelopedinSession1,performthefollowing

analyses(namethecomponentsafterthediagraminFigure3ofthedata-sheet;usea“Vsin”

voltagesourcecomponentfortheinputsignal;usean8Ωresistortomodelthespeaker):

Frequency(AC)analysis:

1)Provideanaccuratecharacterization(Bodeplot)ofthefrequencybehaviouroftheinput

filter(betweenVinandthenon-invertinginputoftheOpAmp).Applyingthe

“superpositionprinciple”,assesstheinfluenceofC3andC5ontheinputsignal.Analyze

theeffectofcapacitorC2ontheinputsignal.

2)Provideanaccuratecharacterizationoftheamplifiercircuit(betweennon-invertinginput

andoutputoftheoperationalamplifier).Whatisthenominalgainofthecircuitinthe

flat-gainregionofthebandwidth?

3)WhatistheDC(orzero-frequency)gain?WhathappensifyourremoveC4fromthe

feedbackloop?

WhatistheroleoftheRC-filterassociatedwithR6C6(trychangingthevalueofone

componentofremovingthem)?

4)Whatcouldyoudoifyouwantedtoprovidetheuserwithavolumecontrol?

5)Ifyounowreplaceyouridealoperationalamplifierwitharealisticoperationalamplifier

model(usecomponentua741;donotconnectpins1and5andconnectalowoutput

load,i.e.ahighresistorvalue,1k),howdoesthisaffectthefrequencybehaviourofyour

circuit?Whyisthat?Canyounowre-discussthepresenceofR6C6network?Repeatthis

withTDA2030.

6)WhatistheroleofC7?

CFKwong,Autumn2016

Time(transient)analysis:

1)Applyingasignalwithamplitude0.1Vandf