le08 - EE2315 Lecture08 Introductionto analyzed realistic

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9/29/2009 1 E E 2315 Lecture 08 Introduction to Operational Amplifiers Operational Amplifiers • Ideal operational amplifiers are easily analyzed • Assumptions for ideal operation are realistic • Inexpensive commercial Op Amps available as integrated circuits • Practical applications for instrumentation, signal processing and control circuits A741 Pinout
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9/29/2009 2 Op Amp Terminals +Vcc Positive supply voltage Inverting -Vcc Output Input Noninverting Input Negative supply voltage Op Amp Terminal Currents +V cc V i o i n i p i c+ -V cc V cc V cc i c- Common Node Op Amp Terminal Voltages +V cc -V cc + + + V cc V cc v p - v o - v n - Common Node
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9/29/2009 3 Equivalent Circuit A(V V ) R o R i p i o p -V n ) i + v o - i n Assumptions for Ideal Op Amp • Open loop Gain, A    v p v n 0 • Then v p v n 0 R i   • R    i 0 and i 0 i p n • Gain is linear up to the saturation voltage • Saturation voltage equals power supply voltage Open Loop Characteristics +V cc v o
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