What is the typical function of a differential amplifier?

The typical function of a differential amplifier is to amplify voltage from two inputs. This type of amplifier is specifically designed to take two input signals and amplify the difference between them while rejecting any signals that are common to both inputs, such as noise. This makes differential amplifiers particularly useful in applications where it is important to eliminate interference and noise, providing a clearer signal.

For example, they are commonly used in instrumentation where small signals need to be amplified and any noise present in the system needs to be minimized. This functionality is essential in scenarios like biomedical instrumentation, where the signals are often very small and can easily be overwhelmed by noise.

In contrast, filtering high frequencies focuses on manipulating the frequency content of signals, converting analog signals to digital involves sampling and quantization, and determining impedance relates more to the characterization of an electrical circuit's response rather than amplification.