What Is a Two-Port Circuit in Gain Definition?

💡 The Answer

• Gain measures the ability of a two-port circuit to increase signal power or amplitude.
• A two-port circuit has an input port and an output port.
• The gain is the mean ratio of the output amplitude or power to the input.
• Two-port circuits include amplifiers, filters, and other signal-processing devices.
• This definition applies to both active and passive circuits, though results differ.