An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input. An amplifier is a circuit that has a power gain greater than one. Amplifier type:Current,Transconductance,Voltage. Each type of amplifier in its ideal form has an ideal input and output resistance that is the same as that of the corresponding dependent source. You can view related stock，price，package,datasheet about specific Amplifier ICs models.you can buy Amplifier ICs at Jotrin by the products list below.