Lecture27-Operational+Amplifier

Lecture27-Operational+Amplifier - ECE 3040 - Dr. Ying Zhang...

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Unformatted text preview: ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 27 Reading: Jaeger 11.1-11.4, Notes ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Common Base and Common Gate Base (or Gate) is neither an input or output Input is Emitter (or Source) Output is Collector (or Drain) ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Common Base/Gate Solution r o o 1 1 1 , , + = + + = th m L m MOSFET v th th m L m BJT v R g R g A r R R g R g A m MOSFET in m BJT in g R r g R 1 1 1 , , = + = ( ) th th m o MOSFET out th th o th th m o th th o th th o o BJT out R R g r R R r R r r R r R r g r R r R r r R r R r R + + = + + + + = + + + + = 1 , , 1 1 , , = = = o MOSFET i o BJT i A A ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Summary of Common Base and Common Gate Characteristics High Voltage Gain Non-Inverting Voltage Gain Very Low Input Impedance Very High Output Impedance The input and output impedances are the opposite of what is typically needed for a voltage amplifier. Thus, Common Emitter/Source amplifiers are normally used instead of Common Base/Gate. ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture: Multistage Amplifier Configurations You can combine or Cascade configurations to produce High Performance amplifiers with High input impedance, low output impedance and huge voltage gains. CS provides High Input Impedance, Moderately high negative gain CE provides High Input Impedance, high gain, and corrects the negative gain from previous stage CC provides Low output Impedance, no gain, but maintains positive gain from previous stage 2 1 2 , 1 , v v v v v v v v v v A o input th s input th s o v = = v 1 v 2 v o ECE 3040 - Dr. Ying Zhang Georgia Tech Ideal Operational Amplifier Inverting Amplifier Non-inverting Amplifier Summing Amplifier Difference Amplifier Active Filters Agenda ECE 3040 - Dr. Ying Zhang Georgia Tech + V out- + V in- Model Operational Amplifier Operational Amplifier or Op-Amp is a multistage amplifier that is used for...
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Lecture27-Operational+Amplifier - ECE 3040 - Dr. Ying Zhang...

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