Realization of a 30 Watt Highly Efficient and Linear Dual-Band Power Amplifier using the Continuous Mode Approach

This paper presents the design methodology and the realization of an highly linear and power-efficient dual-band amplifier based on the Continuous/Class-ABJ. The Class-ABJ theory allows presenting different reactive solutions on both fundamental and second harmonic terminations compared with the standard Class-AB mode. Despite the various terminations, a constant optimum output performance in terms of power, gain and efficiency can still be presented. The output impedances are then translated into frequency thus allowing the realization of broadband PAs. In this work the Class-ABJ broadband approach will be used for the realization of a dual-band power amplifier operating in the two frequency bands 2.1-2.2 GHz and 2.5-2.6 GHz. CW measurements on the realized PA show power and efficiency greater than 17 W and 55% in the two frequency bands with peak values up to 30 W and 64%. Indeed, it is shown that such novel modes can be predistorted and therefore the linearity requirement can also be met. The results shown in this paper make these PA good candidates for the upcoming Femto/Pico base stations used in the wireless communication networks.