When information is sent by radio, the signal carrying the information must be increased in power to a level sufficient for successful transmission. The device that increases the signal level is an Amplifier . Satellite communications is an example of a service that often requires large HPAs. In addition to requiring a high signal level, many communication systems also require that the signal be amplified with a minimum of distortion. Highly linear amplifiers are essential for the efficient transmission of information.
Most amplifiers are inherently non-linear.
LTI accomplishes this by producing modules that correct an amplifier s distortion. These modules are called Linearizers. They are placed in front of the amplifier. The function performed by the linearizer in relation to the amplifier is very similar to that of eyeglasses in relation to the eye . When these two distortions are combined, the result is a clear image.