opamp

# opamp - R Hannemann Operational Amplifiers Ideal Amplifiers...

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R. Hannemann EE305 1 11/10/09 1 Operational Amplifiers Learning Objectives Understand the properties of ideal amplifiers Understand the concept of input and output impedance Understand the concept of gain Know the difference between open-loop and closed-loop mode operations of operational amplifiers Understand the concept of virtual zero Know to differentiate between inverting and non- inverting amplifiers 11/10/09 2 Ideal Amplifiers 11/10/09 3 Ideal Amplifiers v L t = Av S t 11/10/09 4 Operational Amplifier An op amp is an active circuit element designed to perform mathematical operations of addition, subtraction, multiplication, division, differentiation, and integration. 11/10/09 5 Non-Ideal Op Amp v o = Av d = A v 1 v 2 A: open-loop voltage gain (gain of op amp without any external feedback from output to input) typical range: 10 5 to 10 8 11/10/09 6 Closed-Loop Gain When there is a feedback path from output to input,

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