The topology of the balanced amplifier1 allows for power to be added at the output. It’s composed of two amplifiers, which may be multistage implementations, placed between the input power divider and the output power combiner (Fig. 1). To enhance the design, a device known as the “Dual-Fed Distributed Amplifier” (DFDA), has been introduced.2
1. The DFDA amplifier configuration includes an input power divider and an output power combiner.