Op Amp Nonidealities (2) Section 8.4. Topics DC Offset Input Bias Current Speed Limitations Slew Rate.

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Presentation transcript:

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

Small Signal Step Response of a Non-Inverting Amplifier

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

Comparison

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)

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