Op-Amps 02/14/2008 Lecture 9 1 Winter 2012 UCSD: Physics 121; 2012 2 - + 2 3 4 7 6 divot on pin-1 end inverting input non-inverting input V+ V- output Winter 2012 UCSD: Physics 121; 2012 3 Winter 2012 UCSD: Physics 121; 2012 4 - + V- V+ VoutOp-Amps 02/14/2008 Lecture 9 2 Winter 2012 UCSD: Physics 121; 2012 5 - + Vin negative feedback loop Winter 2012 UCSD: Physics 121; 2012 6 - + Vin Important note: op-amp output terminal sources/sinks current at will: not like inputs that have no current flow Winter 2012 UCSD: Physics 121; 2012 7 - + Vin positive feedback: BAD Winter 2012 UCSD: Physics 121; 2012 8Op-Amps 02/14/2008 Lecture 9 3 Winter 2012 UCSD: Physics 121; 2012 9 - + Vin Vout R1 R2 Winter 2012 UCSD: Physics 121; 2012 10 - + Vin Vout R1 R2 Winter 2012 UCSD: Physics 121; 2012 11 - + V1 Vout R1 Rf V2 R2 Winter 2012 UCSD: Physics 121; 2012 12 - + V- Vout R1 R2 V+ R1 R2Op-Amps 02/14/2008 Lecture 9 4 Winter 2012 UCSD: Physics 121; 2012 13 - + Vin Vout C R Winter 2012 UCSD: Physics 121; 2012 14 - + Vin Vout R C Winter 2012 UCSD: Physics 121; 2012 15 Winter 2012 UCSD: Physics 121; 2012 16Op-Amps 02/14/2008 Lecture 9 5 Winter 2012 UCSD: Physics 121; 2012 17 out in V+ V- crossover distortion Winter 2012 UCSD: Physics 121; 2012 18 - + Vin out V+ V- input and output now the same Winter 2012 UCSD: Physics 121; 2012 19 - + Vin dog inverse dog “there is no dog” We owe thanks to Hayes & Horowitz, p. 173 of the student manual companion to the Art of Electronics for this priceless metaphor. Winter 2012 UCSD: Physics 121; 2012
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