Lecture1

Lecture1 - 3. The non inverting input is grounded. Closed...

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Operational Amplifiers, OP-AMPS The Ideal OP-AMP Ideal OP-AMP with Power Supplies No terminal of the OP-AMP is physically connected to ground. Functions and Characteristics of the Op-Amp 1. The Op-Amp senses the voltage difference at its two inputs, multiplies the difference times A and provided the result at the output. 2. The Op-Amp is not supposed to draw any input current (The Input Impedance is supposed to be Infinite). 3. Terminal 3 is supposed to act as an ideal source (zero output impedance). 4. Op-Amps exhibit common–mode rejection. 5. Infinite open-loop gain 6. Infinite bandwidth 7. Direct coupled or DC amplifiers Inputs Output
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Differential and Common-Mode Signals The Inverting Configuration 1. Is one of the two basic configurations. 2. 2 R is applying Negative Feedback.
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Unformatted text preview: 3. The non inverting input is grounded. Closed Loop gain 1 v v G = The Gain depends only on external components Effect of Finite Open-Loop Gain A R R R R v v G / ) / 1 ( 1 / 1 2 1 2 1 + +-= = A R R < < + + ) / 1 ( 1 1 2 ; 1 2 R R G-= Example 2.1 Ω = k R 1 1 , Ω = k R 100 1 , V v I 1 . = Calculate the closed loop gain, the error and 1 v A 1,000 90.83-9.17-9.08mV 10,000 99.00-1.00-0.99mV 100,000 99.90-0.10-0.10mV ε G 1 v Input and output Resistances 1 1 1 / R R v v i v R I I I i = = = The Weighted Summer The Noninverting Configuration The Closed-Loop Gain Effect of Finite Open-Loop Gain A R R R R v v G I ) / ( 1 1 ) / ( 1 1 2 1 2 + + + = ≡ The Voltage Follower Example 2.2...
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This document was uploaded on 12/28/2011.

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Lecture1 - 3. The non inverting input is grounded. Closed...

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