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lect4 - AERO ASTRO 16.682 Prototyping Avionics Spring 2006...

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ASTRO AERO 16.682 - Prototyping Avionics Spring 2006 LECTURE 4 LECTURE 4 February 21, 2006 February 21, 2006 DEPARTMENT OF AERONAUTICS AND ASTRONAUTICS Alvar Saenz-Ot Alvar Saenz-Ot ero ero

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Outline Amplifiers Ideal vs. Real Basic linear uses Voltage follower (current source) Voltage amplifier Voltage invert & subt ract Positive feedback Active filters Massachusetts Institute of Technology 2 16. 6 82 - Prototyping Avionics
Operational Amplifiers Assume ideal during development: v + = v - i + =0, i - =0 Saturation at input power voltage only i + =0 v + v - + - v + pwr Linear Keep in mind for implementat i on: v out Maximum amplification (e.g., 100, i - =0 1000, normally max < 10 6 ) Saturation v - pwr Op-Amps require external +/- supplies! Non-linear region Frequency region Massachusetts Institute of Technology 3 16. 6 82 - Prototyping Avionics

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Buffer/follower Amplifier VCC 1 + - 8 Vout 4 VCC + - 8 4 3 Vin Vin 2 3 1 Vout 2 R1 R2 + v + = v v = v + v + = = V v V in in v V = V out i = 0 i R = out R + R V
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