exp04_add - Agenda and Notes Today during class 9:30 a.m...

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Agenda and Notes Today, during class! 9:30 a.m. Boeing Space and Intelligence Systems (Matt and Matt) 4 extra credit assignments available at the bottom of http://hibp.ecse.rpi.edu/~connor/educati Friday, Oct. 3 (EMPAC!), Open shop 2:00-5:00 p.m
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Electronic Instrumentation Experiment 4 (continued) Part A. Op Amp Basics Review Part B. Adder and Differential Op Amp Part C. Op Amp Limitations
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What is an op amp? An inexpensive, versatile, integrated circuit that is another basic building block to electronics (made of resistors and transistors) Amplifier that has Large open loop gain (intrinsic) Differential input stage, inverting input (-) and non-inverting input (+) One output Uses components in the feedback network to control the relationship between the input and output
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What does an Op-Amp do? Performs “operations” on an input signal Amplification Buffering Integration/Differentiation Addition/Subtraction
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Open Loop/Closed Loop and Feedback Open loop Very high gain (intrinsic gain) Poor stability Open loop gain assumed to be infinite for ideal op amps Closed loop Uses feedback to add stability Reduces gain of the amplifier Output is applied back into the inverting (-) input Most amplifiers are used in this configuration Open loop gain Feedback Σ Vin Vout - +
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Golden Rules of Op-Amp Analysis Rule 1: V A = V B The output attempts to do whatever is necessary to make the voltage difference between the inputs zero. The op-amp “looks” at its input terminals and swings its output terminal around so that the external feedback network brings the input differential to zero. Rule 2: I A = I B = 0 The inputs draw no current The inputs are connected to what is essentially an open circuit
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1) Remove the op-amp from the circuit and draw two circuits (one for the + and one for the – input terminals of the op amp).
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