A generalized MIMO design technique for broadband Doherty power amplifiers based on complex network synthesis methods

Multistandard requirements for wireless infrastructure are driving the need for broadband PAs capable of achieving performance across several bands. Additionally, radar and satellite communications are requiring broadband performance with devices that can be deployed in a broad number of applications. A generalized design technique is presented here that aims to address this need. The MIMO approach accounts for the matching networks of the peaking and carrier amplifiers in a comprehensive manner. The Doherty PA has been a favorite candidate for delivering power and efficiency in narrowband designs. The design technique presented here encompasses the both the carrier, peaking and combining networks of the Doherty PA. This methodology is applicable to N-way Doherty PAs of different structures and can be extended to switched mode PA design as well as reconfigurable PAs.