What does CMRR stand for and what is its purpose?

CMRR stands for Common Mode Rejection Ratio. Its purpose is to filter out unwanted electrical signals, particularly in the context of differential signaling systems. The CMRR measures the ability of a system, such as an amplifier, to reject common-mode signals that are present simultaneously and equally on both input lines while allowing the differential signal of interest to pass through. This characteristic is crucial for enhancing the clarity of the desired signal by minimizing the impact of noise and interference from other sources, which can significantly distort the signal quality.

By focusing on this aspect, CMRR is vital in applications where precision and accuracy of the signal are critical, such as in medical devices monitoring physiological signals, audio processing, or any electronic system requiring high fidelity in signal transmission.