Lecture_8 - ECE103 Spring 2008 Lecture 8 Operational...

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ECE103 Spring 2008 Lecture 8 Operational Amplifiers The operational amplifier (Op Amp) is an electronic unit that behaves as a voltage- controlled voltage source. The Op Amp are commercially available in different packages. The most popular is the DIP package (dual in line package) which consists in an eight contacts with the following pin out: 1 2 3 45 6 7 8 No connection V+ Output Balance Balance Inverting input Noninverting input V- 415 7 2 3 6 The triangle on the right is the symbol used to represent the Op Amps in the circuits schematics. As an active element, the Op Amp must be polarized with an external power supply through pins 4 and 7. The equivalent circuit of an Op Amp is shown in the following figure. + - V1 V2 Vd R i R 0 V 0
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The voltages V1 and V2 are relative to ground. the differential input voltage is 21 d VV V =− . The Op Amp senses the difference voltage between the two inputs and multiplies this difference by the gain A . the value of the voltage controlled voltage
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Lecture_8 - ECE103 Spring 2008 Lecture 8 Operational...

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