Chapter02-Part01-Operational Amplifiers

Chapter02-Part01-Operational Amplifiers - Department of...

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Page 1 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.1 Section 2 Operational Amplifiers Sedra/Smith, Sections 2.1-2.4.1 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.2 Outline of Section 2 2.1 The Ideal Op-Amp –T e r m i n a l s – Characteristics of the ideal op-amp 2.2 Op-Amp Circuits - Inverting Configuration 2.3 Op-Amp Circuits - Non-Inverting Configuration 2.4 Op-Amp Circuits - Applications
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Page 2 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.3 Ideal Op-Amps Wikipedia: “a DC-coupled high-gain electronic voltage amplifier with differential inputs and, usually, a single output. In its ordinary usage, the output is controlled by negative feedback …” v + v - v o Æ Inside: a very complicated transistor circuit! Two inputs Output Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.4 v + v - VDD VSS v o Op-Amps generally have at least five terminals Other terminals may be used for: – DC offset correction – frequency compensation Op-Amp Terminals v + v - v o Normally, the power supply terminals are not shown
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Page 3 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.5 Characteristics of Ideal Op-Amp v + v - v o Op-Amp output is a linearly scaled version of the input voltage difference () + = v v A v o Ideal op-amp characteristics: – infinite input resistance (no current flows into input terminals) – zero output resistance (it doesn’t care what you attach to the output) – Open-loop gain, A, is “very large” (establishes a virtual short ” between input terminals) i=0 i=0 R OUT = 0 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.6 Outline of Section 2 2.1 The Ideal Op-Amp 2.2 Op-Amp Circuits (Inverting Configuration) – Analysis of inverting configuration – Closed-loop input and output resistance – Why feedback using external components is used – An improved inverting configuration – Integrators, Differentiators, and Summers 2.3 Op-Amp Circuits (Non-Inverting Configuration) 2.4 Op-Amp Circuits (Applications)
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Page 4 Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics J. Schwartz, 2007 Operational Amplifiers 2.7 Inverting Closed-Loop Configuration (1) R 1 R 2 v i v o No current flows into input terminals i=0 i=0 Signal current flows only through external resistors i i Op-amp establishes condition ( ) + = = v A v v A v o Write Ohm’s law expressions for signal current 2 1 R v v R v v i o i i = = Algebra: + + = 1 2 1 2 1 1 1 R R A R R v v i o “feedback path”
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This note was uploaded on 12/22/2010 for the course ECSE ecse 330 taught by Professor Rochette during the Winter '10 term at McGill.

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Chapter02-Part01-Operational Amplifiers - Department of...

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