A condition, where two signal applied in differential inputs are of the same phase, frequency and amplified, is called

In common mode, two signals applied in differential inputs are of the same phase, frequency, and amplified.

Additional Information

Common mode:

• A common-mode signal is one that drives both inputs of a differential amplifier equally
• The common-mode signal is interference, static and other kinds of undesirable pickup etc

Application:

• The transistors in the differential amplifier are chosen to be closely matched
• If both the transistors were matched in all respects then the balanced output would be theoretically zero
• This is the important characteristic of a differential amplifier
• It discriminates against common-mode input signals i.e. it refuses to amplify the common-mode signals