LECTURE 9 (full) - CTURE LECTURE 9. OPERATIONAL AMPLIFIERS...

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Unformatted text preview: CTURE LECTURE 9. OPERATIONAL AMPLIFIERS (II) structor: Prof. kyu ark Instructor: Prof. Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) MAE307 Applied Electronics © Inkyu Park, 2010 Pay Attention !! MAE307 Applied Electronics © Inkyu Park, 2010 Review of Lecture 8 perational mplifier (I) Operational Amplifier (I) MAE307 Applied Electronics © Inkyu Park, 2010 Ideal Amplifiers S in in v R v in S R R L in L R Av v out L R R S in L v R R A in S out L R R R R • The amplification factor is dependent on both the source and load impedances. • If the input resistance R in is very large & output resistance R out is very small, in L v R R S S in L L Av v R R A v Amplification factor is independent of MAE307 Applied Electronics © Inkyu Park, 2010 source and load impedances. 01/30 Operational Amplifiers (OP-Amp) • Integrated circuit (a large collection of individual electric and electronic circuits integrated on a single silicon wafer) that can perform a number of operations ddition amplification differentiation integration filtering- addition, amplification, differentiation, integration, filtering, … • V + : non-inverting input • V − : inverting input • output V out : output • V S + : positive power supply • V S − : negative power supply MAE307 Applied Electronics © Inkyu Park, 2010 02/30 Operational Amplifiers • Ideal OP-Amp behaves as an ideal difference amplifier (amplifies the difference between two input voltages). ear finite input resistance (R and very large output resistance (R • Near-infinite input resistance (R in ) and very large output resistance (R out ). v v A t v OL V out ) ( ) ( : Open-loop voltage gain (10 5-10 7 ) ) ( OL V A v : Noninverting input : Inverting input v • Due to near-infinite input resistance, it is usually assumed that the input current is zero. in i • Due to near-infinite open-loop gain, MAE307 Applied Electronics © Inkyu Park, 2010 v v 03/30 Operational Amplifiers • Pin #1 & #5 : Offset null • in #2 : Inverting Input Pin #2 : Inverting Input • Pin #3 : Noninverting Input • Pin #4 : Negative power supply (-V CC ) • in #6 : Output Pin 6 : Output • Pin #7 : Positive power supply (+V CC ) • Pin #8 : No connection MAE307 Applied Electronics © Inkyu Park, 2010 04/30 Operational Amplifier in Closed-Loop Mode : Inverting Amplifier- In the open-loop model for the op-amp, v A v v A v OL V OL V out ) ( ) ( Connected to the ground (zero)- CL at node A : node A in F S i i i eedback current ource current Input current=0 KCL at node A : Feedback current Source current S S v v i out F v v i in i S R F R / / ) ( ) ( OL V out out OL V out S out S R A v v R A v v R v v R v v F S F S...
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This note was uploaded on 11/21/2010 for the course MECHANICAL mae302 taught by Professor Jang during the Spring '10 term at Seoul National.

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LECTURE 9 (full) - CTURE LECTURE 9. OPERATIONAL AMPLIFIERS...

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