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The load modulated balanced amplifier (LMBA) technique uses a control signal, injected at the output coupler, to modulate the impedance of the balanced amplifier transistors. A 14.1-W X-band LMBA is reported, integrating for the first time the balanced, driver, and control signal amplifiers in a single microwave monolithic integrated circuit. Load modulation and bias settings are used to demonstrate that high circuit efficiency can be achieved as the LMBA is adjusted for operation in three RF-power regimes; 1.5, 5.6, and 14.1 W for a constant input power of 22 dBm. Power-added efficiencies above 37% are observed in all power regimes from 8 to 9 GHz under saturated conditions.

ieee microwave and wireless components letters

A Power Reconfigurable High-Efficiency <inline-formula> <tex-math notation="LaTeX">$X$ </tex-math></inline-formula>-Band Power Amplifier MMIC Using the Load Modulated Balanced Amplifier Technique

A Power Reconfigurable High-Efficiency $X$ -Band Power Amplifier MMIC Using the Load Modulated Balanced Amplifier Technique