What Does CMRR Stand For?

CMRR stands for Common Mode Rejection Ratio

CMRR, or Common Mode Rejection Ratio, is a performance metric that quantifies an electronic circuit's ability to reject common-mode signals—interference that affects both inputs equally—while amplifying differential signals. Expressed in decibels (dB), a higher CMRR indicates superior capability in distinguishing the desired signal from noise, making it a critical factor in the design of amplifiers and audio equipment. It is essential for ensuring accurate signal processing in various applications, including telecommunications and instrumentation.