Frequency extension of system level characterization and predistortion setup for on-wafer microwave power amplifiers

In this paper, a system level characterization setup for on-wafer microwave power amplifiers is presented. The arbitrary waveform generator carrier frequency limitations are overcome by the insertion of an upconversion system. Linearity tests are performed to assess the validity of the proposed solution. A simple on-wafer calibration method for absolute power determination is developed, allowing for accurate average power and efficiency measurement in presence of modulated signals. A characterization and predistortion example on a backhaul 7 GHz Doherty power amplifier is carried out, highlighting the capabilities of the proposed setup.