DESIGN OF HIGH-PERFORMANCE POWER-DISTRIBUTED AMPLIFIER USING LANGE COUPLERS

An innovative topology of distributed amplifier based on input and out put Lange couplers is presented. The modified operation mechanism of t he new configuration, in comparison to the conventional distributed am plifier, determines a remarkable improvement of the output power, powe r-added efficiency, and small signal gain. The principle of the new am plifier topology, the theory, and several analytical results are discu ssed extensively. In addition, an accurate study and comparison betwee n the performance of the Lange coupler distributed amplifier and the c onventional distributed amplifier confirm the advantages of the config uration suggested. The Lange coupler distributed amplifier will be pro ved suitable in either large or small signal, as well as wide or narro wband applications.