Lecture17a - Lecture 17. NON-IDEAL AMPLIFIER PROPERTIES...

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Lecture 17. NON-IDEAL AMPLIFIER PROPERTIES Objectives: Topics: Find the output of amplifier circuits Find the maximum rate of the input signal Find the bandwidth of amplifier circuits Output Voltage Limits Slew-Rate Limitation Finite Frequency Response
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Non-Ideal Properties a) Output limit – bounded by V pos and V neg b) Slew-rate limitation; c) Bandwidth limitation SLEW-RATE LIMITATION Ideal op-amp Real op-amp Output changes instantaneously Rate of change slew rate Limitation due to internal circuitry (capacitances) v IN t 1 -1 v OUT t 12 -12 v IN v OUT + - 12 -12 Op-amp driven to slew-rate limits nonlinear output behavior
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EXAMPLE Inverting amplifier, Gain=-10, slew rate = 1 V/ µ s, ± 15V power supply, v IN =V 0 sin(wt)=1sin(wt) a) f max - ? (before the output is affected by slew-rate distortions) b) v OUT - ? (if V 0 =1.5V @ f max ) v IN t 1 -1 v OUT t 10 -10 a) Max slope Max slope = slew rate
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b) V 0 =1.5V, f=16kHz v OUT 15 -15 t undistorted sinusoid To simplify analysis: v OUT =-15cos(wt)
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This note was uploaded on 06/30/2010 for the course EECE 315 taught by Professor Nikulin during the Fall '08 term at Binghamton University.

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Lecture17a - Lecture 17. NON-IDEAL AMPLIFIER PROPERTIES...

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