07.26.12 -- Searching For 1,000 Times The Capacity Of 4G Wireless
The Evolving Radio Base Station TX Signal Chain By Maury Wood, NXP Semiconductors
RF Power Amplifiers (PAs) are rapidly evolving. While digitally pre-distorted silicon LDMOS amplifiers in two-way asymmetric Doherty configurations are mainstream today, three-way asymmetric and symmetric Doherty topologies are gaining design win momentum in 4G LTE radio base stations. Multi-way Doherty GaN amplifiers, with their superior power density and wider operating bandwidth characteristics, look to be the optimal next generation technology, particularly above 2.5 GHz or so.