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Op Amp Nonidealities (2)

Op Amp Nonidealities (2) . Section 8.4 . Topics. DC Offset Input Bias Current Speed Limitations Slew Rate. Finite Bandwidth. Internal capacitances of the op-amp degrade the performance at high frequencies. Bandwidth of a Noninverting Amplifier. Effective Bandwidth.

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Op Amp Nonidealities (2)

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  1. Op Amp Nonidealities (2) Section 8.4

  2. Topics • DC Offset • Input Bias Current • Speed Limitations • Slew Rate

  3. Finite Bandwidth Internal capacitances of the op-amp degrade the performance at high frequencies.

  4. Bandwidth of a Noninverting Amplifier

  5. Effective Bandwidth

  6. Small Signal Step Response of a Non-Inverting Amplifier

  7. Large Signal Response of a Non-Inverting Amplifier Internal circuitry is reduced to a current charging a capacitor→slewing!

  8. Comparison

  9. Large Signal Sine wave to a non-inverting amplifier (No slewing!) (Slewing, worst case at zero crossing) (Slewing of the op-amp must exceed max. dVout/dt)

  10. Full-Power Bandwidth (maximum allowable swing without saturation) (A measure of useful large signal Speed of an op-amp)

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