A MMIC smart power amplifier with on-chip dynamic bias controller for WCDMA mobile communication

This work presents an InGaP/GaAs HBT smart MMIC power amplifier provided with a new dynamic bias controller and dual power stages in parallel. The proposed dynamic bias circuit controls the quiescent current as a function of input power with perfect freedom, and is implemented for a WCDMA MMIC power amplifier together with the parallel power stages for both linearity and efficiency. Maximum output power, PAE, and gain are simulated to have 31.3 dBm, 40.8%, and 23.9 dB, respectively in WCDMA conditions. The smart power amplifier exhibits an improvement of average power usage efficiency by 220 % while keeping the WCDMA linearity.