A novel wideband frequency-tunable feedforward power amplifier [RF]

A novel feedforward amplifier with frequency tunable ability was studied for wideband wireless communication applications. This kind of feedforward amplifier is based on the complex gain stability approach proposed before, but what is different is the add-on adaptive function in frequency, thus making it able to work within a wider frequency range, and keeping very good performance at the same time. The amplifier is suitable for narrow bandwidth signals whose central frequency sometimes changes in a wide range, for instance, a repeater system.