To minimize drift in an input signal amplifier without affecting the performance of the circuit, the correct answer is (d) All of the mentioned.
Drift refers to the unwanted change in output voltage over time due to variations in temperature and aging of components. Here are the methods to minimize drift:
1. Choosing small value of external components - Using smaller values reduces parasitic effects and temperature-dependent variations that contribute to drift.
2. Enhancing the input signal amplifier - Better quality amplifiers with lower temperature coefficients reduce drift effects.
3. Reducing the gain of op-amp - Lower closed-loop gains have lower offset voltage multiplication factors, thus minimizing drift effects on the output.
All three methods combined provide comprehensive drift reduction without affecting circuit performance. Temperature compensation and careful component selection are essential for achieving stable amplification in precision applications.