Which of the following parameters is related to the performance of a differential amplifier?

The performance of a differential amplifier is closely linked to its input impedance, which plays a crucial role in determining how the amplifier interacts with the signals it is processing. High input impedance is essential in minimizing the loading effect on the signal sources, allowing the amplifier to accurately reflect the difference between two input signals without significantly altering them. This characteristic is vital in applications like neurophysiologic intraoperative monitoring, where preserving the integrity of the small bioelectric signals from neural activity is important for accurate measurements.

A differential amplifier typically amplifies the voltage difference between its two inputs while rejecting any signals common to both inputs, a feature known as common-mode rejection. High input impedance contributes to this capability by ensuring that the amplifier does not draw significant current from the signal sources, thus preserving the original signal’s amplitude and shape. Essentially, this results in better performance in detecting and amplifying relevant signals while minimizing noise and interference.

While the other parameters listed, like voltage rating, current sensitivity, and signal bandwidth, are significant in their contexts, they do not directly relate to the fundamental operation of the differential amplifier in the same way that input impedance does. Each of those parameters plays a role in the overall characteristics of an amplifier but does not specifically enhance the interaction or reduction of interference