Power amplifier linearization using feedforward technique for wide band communication system

The performance of a wireless communication system depends on amplifier's nonlinearity. In this paper, Feed-forward amplifier implementation for wideband communication system are introduced. By adding a new distortion cancellation loop to the original feedforward structure, improved measurement for large linearity power output is presented. The intermodulation distortion (IMD) for two tone harmonic balance has been reduced to -90.5 dBm. A UMTS downlink channel has been used as application case.