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 g The ideal operational amplifier n Terminals n Basic ideal op-amp properties g Op-amp families g Operational amplifier circuits n Comparator and buffer n Inverting and non-inverting amplifier n Summing and differential amplifier n Integrating and differentiating amplifier n Current-voltage conversion
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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 2 The ideal op-amp g Primary op-amp terminals n Inverting input n Non-inverting input n Output n Power supply From [Car91]
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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 3 Ideal op-amp characteristics g The ideal op-amp is characterized by seven properties n Knowledge of these properties is sufficient to design and analyze a large number of useful circuits g Basic op-amp properties n Infinite open-loop voltage gain n Infinite input impedance n Zero output impedance n Zero noise contribution n Zero DC output offset n Infinite bandwidth n Differential inputs that stick together
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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 4 Ideal Op-Amp Properties g Property No.1: Infinite Open-Loop Gain n Open-Loop Gain A vol is the gain of the op-amp without positive or negative feedback n In the ideal op-amp A vol is infinite g Typical values range from 20,000 to 200,000 in real devices g Property No.2: Infinite Input Impedance n Input impedance is the ratio of input voltage to input current n When Z in is infinite, the input current I in =0 g High-grade op-amps can have input impedance in the T range n Some low-grade op-amps, on the other hand, can have mA input currents in in in I V Z =
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Intelligent Sensor Systems Ricardo Gutierrez-Osuna Wright State University 5
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This note was uploaded on 08/22/2011 for the course EEE 230 taught by Professor Subramanian during the Spring '07 term at University of California, Berkeley.

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

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