A linear 250 watt Doherty power amplifier based on two-stage power ICs for 1.8 GHz single and multi-carrier GSM applications
In this paper we describe the design and measured performance of a Doherty power amplifier constructed using two-stage power amplifier IC building blocks. The Doherty PA was designed for single- and multi-carrier GSM applications in the 1800 MHz band. The 3-dB compression point of the amplifier is 54 dBm, and the PA displays excellent raw linearity for use in single-carrier GSM applications. Using a commercial digital predistortion system, the amplifier provides power output of 47 dBm at −70 dBc correction with a two-carrier GSM signal, and 45.5 dBm at −60 dBc correction with a four-carrier GSM signal.