Chapter_9_Kim_F.pdf

# Chapter_9_Kim_F.pdf

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Chapter 9 Ideal Operational Amplifier and OP Amp Circuit and OP Amp Circuit

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Overview 1. Develop the parameters and characteristics of the ideal operational amplifier and determine the analysis method of operational amplifier, and determine the analysis method of ideal op-amp circuits. (a) inverting operational amplifier (b) s mming ope ational amplifie (b) summing operational amplifier (c) noninverting operational amplifier 2 Analyze several ideal op-amp circuits including the 2. Analyze several ideal op amp circuits including the difference amplifier, the instrumentation amplifier and operational transconductance amplifier. 3. Design several ideal op-amp circuits with given design specifications.
9.1 Operational Amplifier - First amplifier is introduced by the Fairchild Semiconductor in 1965. - uA741 in late of 1960s by the Fairchild Semiconductor. - Very widely used - Usually consists of 20-30 transistors V+ Output is limited by V+ and V- Assumption for Ideal Op-Amp 1 Ri between V1 and V2 are infinite V 1.Ri between V1 and V2 are infinite. (Current is zero) 2.Small signal output resistance Ro is zero 3.Aod is open loop differential voltage gain

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9.1.2 Development of Ideal Parameters - MOSFET Case (Property of an ideal OP Amp) With v V V v External R 1 1 v v F O gs I gs I R R = ) ( F I gs F O I I R R V R R + = + KCL1: KCL2: O gs V g v V 1 O v V gs m F R = ) 1 ( m F F gs g R R = ) 1 1 ( R g R v R g is very high ) 1 1 ( F m F m I F O I R g R v + = I F R m
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