Yhteisjänniteherkkyys

Yhteisjänniteherkkyys, known in English as common-source immunity, is a measure of the effectiveness of a differential amplifier in rejecting unwanted signals that are present on both input terminals. Ideally, a differential amplifier amplifies the difference between its two inputs while completely ignoring any signal that is common to both. However, in reality, a small portion of this common-mode signal often appears at the output. Yhteisjänniteherkkyys quantifies this imperfection.

It is typically expressed as a ratio of the differential gain (Ad) to the common-mode gain (Ac), often in decibels. A high yhteisjänniteherkkyys indicates that the amplifier is very good at rejecting common-mode signals. Conversely, a low value suggests that common-mode signals can significantly affect the output. This parameter is crucial in applications where signals are susceptible to noise picked up on both input lines, such as in telecommunications or sensor interfaces. Minimizing common-mode gain is a key design goal for differential amplifiers to ensure accurate signal processing.