A 350W, 2GHz, 44% efficient LDMOS power amplifier design with capability to handle a wideband 65MHz envelope signal

In this paper we demonstrate high gain, high efficiency, single and balanced Doherty power amplifiers (PAs) that have the ability to transmit signals which occupy the full frequency band from 1930MHz–1995MHz. The PAs have been designed using a new generation of Freescale LDMOS power transistors [1], in which the drain side video-bandwidth (VBW) has been enhanced. For the first time we will show the ability of the PA to handle wideband envelope signals (> 80MHz) with excellent nonlinearity correction using Digital Pre-distortion (DPD). Narrow band as well as wideband DPD measurement results will be presented for single and balanced Doherty PAs including driver stages. These RF Doherty PAs are targeted for use in next generation wideband wireless communication systems.