元器件交易网
SGLS371–JANUARY2007
GENERALINFORMATION(continued)
VoltageSettingandModulatorGain
Sincetheinputcurrenttotheerroramplifierisnegligible,thefeedbackimpedancecanbeselectedoverawiderange.Knowingthatthereferencevoltageis708mV,pickaconvenientvalueforR1andthencalculatethevalueofR2fromthefollowingformula:
æR2ö
÷+VOUT=0.708ç1çR÷1øè(7)
Figure30.SystemGainElements
TheerroramplifierhasaDCopen-loopgainofatleast60dB,withaminimumofa1.5-MHzgainbandwidth
product,whichgivestheuserflexibilitywithrespecttothetypeoffeedbackcompensationusedforthisparticularapplication.Thegainselectedbytheuseratthecrossoverfrequencyissettoprovideanoverallunitygainforthesystem.Thecrossoverfrequencyshouldbeselectedsothattheerroramplifieropen-loopgainishighwithrespecttotherequiredclosed-loopgain.Thisensuresthattheamplifierresponseisdeterminedbythepassivefeedbackelements.
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