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 analyz
Output Voltage Swing Output Current Limits. Figure 2.28 . For a real op amp, clipping occurs if the output voltage reaches certain limits. For µA741: If the supply voltages are +15V and –15V the amplitude of the output voltage without clipping is 14V typically (guaranteed is 12V). The maximum that an Op Amp can supply to a load is restricted.
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