Power Amplifier Linearization Using Feedforward Technique for Wide Band Communication System

摘要

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 feed-forward structure, improved measurement for large linearity power output is presented. The intermodulation distortion (IMD) for two tone harmonic balance has been reduced to -90.5dBm. A UMTS downlink channel has be en used as application case.