Learning Path
Question & Answer
Choose the Best Answer
Higher input impedance generally improves PSRR and reduces thermal drift
Higher input impedance worsens PSRR and increases thermal drift
Input impedance has no effect on PSRR or thermal drift
Lower input impedance improves PSRR but increases thermal drift
Understanding the Answer
Let's break down why this is correct
A higher input impedance means the op‑amp draws little current from the previous stage. Other options are incorrect because The idea that more input impedance hurts PSRR comes from confusing impedance with noise; Thinking input impedance has no effect ignores how the op‑amp pulls current from the supply.
Key Concepts
Op-Amp Gain and Practical Considerations
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Deep Dive: Op-Amp Gain and Practical Considerations
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Definition
While op-amps do not have infinite gain in practice, their high gain allows for reliable circuit design using negative feedback. Op-amp gain specifications vary between models, and practical op-amp circuits rely on predictable gain behavior.
Topic Definition
While op-amps do not have infinite gain in practice, their high gain allows for reliable circuit design using negative feedback. Op-amp gain specifications vary between models, and practical op-amp circuits rely on predictable gain behavior.
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