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opamp1

opamp1 - ELEC 101 1 Op Amp Circuits 1 2009/10 Spring...

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ELEC 101 Op Amp Circuits 1 2009/10 Spring Voltage Amplifier also called Voltage-Controlled Voltage- Amplifier or V-to-V converter 1 R i : input resistance Circuit Model of voltage amplifier A V V i R i R O R O : output resistance A V : voltage gain V i : input voltage V O : output voltage a V O V i Example: HiFi pre-amp

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ELEC 101 Op Amp Circuits 2 2009/10 Spring A V V i R L R S R O load V S Circuit Model of source – voltage amplifier – load amplifier source R S : source resistance R L : load resistance For ideal voltage amplifier , R i = ( R i >> R S ) R O = 0 ( R O << R L ) R i b c S V O V A V 0 A V V i R i R O V i V O V O V i V S : source voltage Proof S i S i V V R R  S V i V O O L V A V A V R R  d With R i = With R O = 0
ELEC 101 Op Amp Circuits 3 2009/10 Spring Example Temperature sensor Voltage amplifier Meter display V S = 0V at 0 C +1mV/ C R S = 300 R i = 2k R O = 400 R L = 10k V O + - + - V i 0V 1V 0 C 100 C Find voltage gain A V of the voltage amplifier. Need to have V O = 1V when V S = 100mV (at 100 C)

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