Lecture 02 Winter 2010

Lecture 02 Winter 2010 - 1 ECSE 330 Introduction to...

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Unformatted text preview: 1 ECSE 330 Introduction to Electronics Lecture 02: Operational Amplifiers Roni Khazaka R. Khazaka ECSE330 Introduction to Electronics OpAmp Symbol 2 -15V +15V + - + - v + + - v- + - v o A v o = A ( v + - v- ) i o i 1 i 2 2 R. Khazaka ECSE330 Introduction to Electronics 3 + - v- v o A v o = A ( v + - v- ) i o v + 1. Supply voltages are not shown. 2. Supply currents are not shown (Be careful with KCL). 3. Never do KCL at reference node (otherwise need to include supply currents). R. Khazaka ECSE330 Introduction to Electronics Ideal OpAmp 4 + - v- v o A v o = A ( v + - v- ) i o v + 3 R. Khazaka ECSE330 Introduction to Electronics Virtual Short Principle 5 Assuming v O is finite (no clipping), and infinite gain ( A is infinite): R. Khazaka ECSE330 Introduction to Electronics Inverting Amplifier 6 Virtual Ground 4 R. Khazaka ECSE330 Introduction to Electronics Effect of Finite Gain 7 1 + R 2 R 1 ( ) << A v O v I = R 2 R 1 1 + 1 + R 2 R 1 ( ) A Infinite Opamp Gain R. Khazaka ECSE330 Introduction to Electronics Input/Output Resistance 8 5 R. Khazaka ECSE330 Introduction to Electronics High Input Impedance Config. 9 Virtual Ground R. Khazaka ECSE330 Introduction to Electronics High Input Impedance Config. 10 Virtual Ground 6 R. Khazaka ECSE330 Introduction to Electronics Weighted Summer 11 R. Khazaka ECSE330 Introduction to Electronics Weighted Summer -- coef of both signs 12 7...
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Lecture 02 Winter 2010 - 1 ECSE 330 Introduction to...

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