Transcription of 2. Operational Amplifiers
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2. Operational Amplifiers
2. Operational AmplifiersTLT-8016 Basic Analog Circuits2005/200612. Operational Amplifiers2. Operational AmplifiersTLT-8016 Basic Analog Circuits2005/20062 Figure circuit symbol for the op amplifier : A differential amplifier with very high voltage gain. Usually realized as integrated Operational AmplifiersTLT-8016 Basic Analog Circuits2005 The Ideal Operational AmplifierIdeal Operational amplifier : Infinite input impedance. Infinite open loop gain AOLfor differential signal. Zero gain for the common -mode signal. Zero output impedance. Infinite Equivalent circuit for the ideal op amp. AOLis very large (approaching infinity).Common-mode input signal)(2121vvvicm+=Differential input signal21vvvid =Figure Op-amp symbol showing power Operational AmplifiersTLT-8016 Basic Analog Circuits2005 The Summing-Point Constraint Operational Amplifiers are almost always used with negative feedback, in which part of the op-amp output signal is returned to the input in opposition to the source op-amp circuits are analyzed by the following steps:1.
TLT-8016 Basic Analog Circuits. 2005/2006. 13. Example 2.2 Amplifier Design. Suppose that we need an amplifier with input resistance of 500 kΩor greater and a voltage gain of -10. The feedback resistors are to be implemented in integrated form and have values of 10 kΩor less to conserve chip area. Choose a suitable circuit configuration and ...
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