What is the term for the (+) input of a differential amplifier?

The term for the positive input of a differential amplifier is indeed known as the non-inverting input. In a differential amplifier, there are two inputs: one that is designed to amplify the signal and another to serve as a reference point. The non-inverting input receives the signal that you wish to amplify while maintaining its phase. This means that when a positive voltage is applied to this input, the output of the amplifier will also move positively relative to the other input.

In contrast, the inverting input is where the signal is inverted in phase, causing the output to respond oppositely to changes in the input voltage. The common input is not a standard term utilized in the context of differential amplifiers, and while a reference input may be part of certain configurations, it does not specifically refer to the positive input in a standard differential amplifier setup. Understanding these distinctions is crucial for working effectively with differential amplifiers in various applications, particularly in neurophysiologic monitoring where accurate signal amplification is essential.