Transducer Gain: G_T is the overall gain of amplifier referred to as the Transducer Gain. It is defined as:

In terms of the S parameters of the transistor, it is given by two equivalent equations:
Here

• Gs = Source reflection ooeficient
• G_L = Load reflection ooeficient
• G_in = Input reflection ooeficient
• G_out = Output reflection ooeficient
• S₂₁, S₁₁,and S₂₂ are the [S] parameters of the transistor