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Understanding Op-Amp Circuit Performance: Gain, Bandwidth, Input & Output Impedance

This guide explores key characteristics of op-amp circuits, including gain, bandwidth, and impedance at low frequencies. We examine gain values like -0.5, -2, and 3, and determine bandwidth implications when the op-amp fT is 100 MHz. Important input and output impedances are discussed, considering the dependencies on the open-loop gain (A) of the op-amp. This resource is essential for electronics enthusiasts aiming to deepen their understanding of op-amp circuit behavior.

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Understanding Op-Amp Circuit Performance: Gain, Bandwidth, Input & Output Impedance

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  1. H3 What is the gain? • -0.5 • -2 • 3 • -0.333 • This circuit won’t work 10k 20k Vin Vout

  2. H3 What is the bandwidth of this circuit if the op-amp fT is 100 MHz? • 10 MHz • 1 MHz • 100 MHz • 10 kHz • This circuit won’t work 1M 10k Vin Vout

  3. H3 What is the input impedance of this circuit at low frequencies? • Very small, depends on A of op-amp • Close to 100k • Very large, depends on A of op-amp • Close to 10k • Cannot be determined 100k 10k Vin Vout

  4. H3 What is the output impedance of this circuit at low frequencies? • Very small, depends on A of op-amp • Close to 100k • Very large, depends on A of op-amp • Close to 10k • Cannot be determined 100k 10k Vin Vout

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