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Slew Rate

Slew Rate. M.S.P.V.L Polytechnic College, Pavoorchatram. Introduction. The slew rate is an important characteristic for amplifiers and electronic s of elements The slew rate represents the maximum rate of change of a signal at any point in a circuit.

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Slew Rate

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  1. Slew Rate M.S.P.V.L Polytechnic College, Pavoorchatram. www.ustudy.in

  2. Introduction • The slew rate is an important characteristic for amplifiers and electronics of elements • The slew rate represents the maximum rate of change of a signal at any point in a circuit. • Limitations in slew rate capability can give rise to non linear effects in electronic amplifiers. www.ustudy.in

  3. OP-AMP Slew Rate www.ustudy.in

  4. Cont., • For a sinusoidal waveform not to be subject to slew rate limitation, the slew rate capability (in volts per second) at all points in an amplifier must satisfy the following condition: Vpk SR www.ustudy.in

  5. Definition • The output slew-rate of an amplifier or other electronic circuit is defined as the maximum rate of change of the output voltage for all possible input signals. ( ( dvout(t) = max SR dt www.ustudy.in

  6. Slew Rate switching diagram www.ustudy.in

  7. Slew Rate Calculation • Step1 • Obtain a voltage versus time plot of an electronic waveform for the electronic component you want to know about. • You can ask the component's manufacturer for a data sheet that illustrates the slew rate.  www.ustudy.in

  8. Slew Rate Calculation • Step2 • Calculate the voltage change. Subtract the lowest voltage from the highest voltage. • Conclude that for a high voltage of 5 volts and a low voltage of 0 Volts, the voltage change is 5 Volts, since 5 minus 0 is 5. www.ustudy.in

  9. Slew Rate Calculation • Step3 • Calculate the time change. Subtract the time at which the lowest value voltage occurs from the time the highest value voltage occurs. • Conclude that if a low voltage of 0 volts occurred at time, 1 second and that a high voltage of 5 volts occurred at time, 4 seconds, the time change would be 3 seconds, since 4 minus 1 is 3. www.ustudy.in

  10. Slew Rate Calculation • Step4 • Calculate the slew rate. • Divide the voltage change by the time change. • Conclude that if the voltage change was 5 volts and the time change was 3 seconds, the slew rate would be 1.66 Volts per second, since 5 divided by 3 is 1.66. www.ustudy.in

  11. No overshooting arises in the output wave form www.ustudy.in

  12. Rising flanks of the signals www.ustudy.in

  13. Falling flanks of the signals www.ustudy.in

  14. The End • ....... Thank You ……. www.ustudy.in

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