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iss_l5

# iss_l5 - Lecture 5 The ideal operational amplifier g The...

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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 1 Lecture 5: The ideal operational amplifier The ideal operational amplifier Terminals Basic ideal op-amp properties Op-amp families Operational amplifier circuits Comparator and buffer Inverting and non-inverting amplifier Summing and differential amplifier Integrating and differentiating amplifier Current-voltage conversion

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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 2 The ideal op-amp Primary op-amp terminals Inverting input Non-inverting input Output Power supply From [Car91]
Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 3 Ideal op-amp characteristics The ideal op-amp is characterized by seven properties Knowledge of these properties is sufficient to design and analyze a large number of useful circuits Basic op-amp properties Infinite open-loop voltage gain Infinite input impedance Zero output impedance Zero noise contribution Zero DC output offset Infinite bandwidth Differential inputs that stick together

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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 4 Ideal Op-Amp Properties Property No.1: Infinite Open-Loop Gain Open-Loop Gain A vol is the gain of the op-amp without positive or negative feedback In the ideal op-amp A vol is infinite Typical values range from 20,000 to 200,000 in real devices Property No.2: Infinite Input Impedance Input impedance is the ratio of input voltage to input current When Z in is infinite, the input current I in =0 High-grade op-amps can have input impedance in the T range Some low-grade op-amps, on the other hand, can have mA input currents in in in I V Z =
Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 5 Ideal Op-Amp Properties Property No. 3: Zero Output Impedance

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iss_l5 - Lecture 5 The ideal operational amplifier g The...

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