OpAmps - Ch Chapter 2: Operational Amplifiers Amplifiers...

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Chapter 2: Operational mplifiers Amplifiers Fall 2010 E 230: Electronic Circuits EE 230: Electronic Circuits and Systems imothy A Bigelow Timothy A. Bigelow 1
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Image of Op-Amp 2
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More Wiring Diagrams for Op- Amps 3
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Op-Amp Terminals Positive Power Supply + Noninverting Input Output - Inverting Input Negative Power upply 4 Supply
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741 Op Amp 5
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Op-Amp Currents and Voltages   p nC C CC A vv V V A v v A v v V   + v p v o      op n p n C C CC p C vA V A V   - + - - V CC v n C re bias voltages + V CC V CC are bias voltages that set the usable range of output voltages. 6
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Circuit Model for Ideal Op- Amp 7 Microelectronic Circuits - Fifth Edition Sedra/Smith
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Op-Amp Currents and Voltages + i p i o i c+ - + - V CC i n i c- + - V CC 8
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Ideal Op-Amp Approximations The gain of the Op-Amp, A, is infinite. p n vv Use linear feedback to force linear operation. Fraction of output subtracted from input. The currents flowing into the inputs, i p and i n , are zero. i 9 0 pn ii 
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Rules for Solving Circuits for Op-Amps Solve for currents and voltages assuming eal Op- mp equations are valid. ideal Op Amp equations are valid. p n vv 0 p n ii If v o is greater than +V CC or less than –V CC the Op-Amp has saturated and v o must be +V CC or –V CC respectively. 10 Note: v p may no longer equal v n .
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Op-Amp Example 80 k - 10 V + 5 V v o 16 k -15 V + - v s 11
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Op-Amp Example 80 k 5 os vv  - 10 V + 5 V v o 16 k -15 V + - v s 12
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Op-Amp Example 2 100 k Find v o in terms of v a and v b .
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This note was uploaded on 10/16/2010 for the course EE 201 taught by Professor Kruempel during the Spring '06 term at Iowa State.

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OpAmps - Ch Chapter 2: Operational Amplifiers Amplifiers...

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