ECE201_Lecture26

ECE201_Lecture26 - ECE201 Linear Circuit Analysis I Lecture...

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1 ECE201 Linear Circuit Analysis I Lecture 26 Topics: Operational Amplifier (Op-Amp) basics: dependent source models Operational Amplifiers (Op Amp) 1. Notation The Op Amp is a 3 terminal device: v : voltage drop from inverting input to ground. v + : voltage drop from non-inverting input to ground. v 0 : voltage drop from output to ground. 2. The Ideal Operational Amplifier For any Operational Amplifier: Let v d = v + v Then v o = f(v d ), and it looks like the following: v v + v o output + inverting input non-inverting input v o = f(v d ) + saturation v d = v + – v linear active region 0 – saturation (very large) A = v o v d
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2 (1) An ideal OpAmp has infinite gain: A → ∞ If v d = 0, then –V sat ≤ v o ≤ V sat (the exact value of v 0 depends on the circuit) If v d > 0, then v o = V sat If v d < 0, then v o = –V sat Note that v o can only be controlled if v d = 0. Therefore, for analysis of ideal OpAmp, v + = v i.e., virtual short circuit .
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ECE201_Lecture26 - ECE201 Linear Circuit Analysis I Lecture...

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