The ability of a differential amplifier to minimize signals similar to both inputs is known as:

The ability of a differential amplifier to minimize signals similar to both inputs is known as:

• A. Common mode rejection
• B. Impedance
• C. Analog-to-digital converter
• D. Signal-to-noise ratio

Answer: (A)

The ability to ignore signals that appear on both inputs is common-mode rejection. A differential amplifier focuses on the difference between its two inputs, so any signal that is the same on both sides—like electrical noise or interference that couples equally to both inputs—is cancelled out as much as possible. The stronger this cancellation, the higher the common-mode rejection ratio (CMRR), typically measured in decibels. This is especially important in biopotential measurements where interference from power lines or electrode impedance changes can affect both inputs similarly, and you want the amplifier to reject that shared noise while faithfully amplifying the true differential signal. Other terms like impedance (opposition to current), analog-to-digital conversion, and signal-to-noise ratio describe different concepts and aren’t the mechanism by which the amplifier reduces identical inputs.

The ability to ignore signals that appear on both inputs is common-mode rejection. A differential amplifier focuses on the difference between its two inputs, so any signal that is the same on both sides—like electrical noise or interference that couples equally to both inputs—is cancelled out as much as possible. The stronger this cancellation, the higher the common-mode rejection ratio (CMRR), typically measured in decibels. This is especially important in biopotential measurements where interference from power lines or electrode impedance changes can affect both inputs similarly, and you want the amplifier to reject that shared noise while faithfully amplifying the true differential signal. Other terms like impedance (opposition to current), analog-to-digital conversion, and signal-to-noise ratio describe different concepts and aren’t the mechanism by which the amplifier reduces identical inputs.