This contribution presents a creative circuit level solution to improve the efficiency versus frequency response of the Doherty amplifier. The proposed approach is compared with the conventional one and experimentally validated through a practical prototype realization based on GaN-HEMTs. Continuous wave measurements have shown a 65%-51% efficiency at about 42-36.5-dBm output power from 1.95-GHz to 2.25-GHz. When tested with a mobile WiMAX signal with 5MHz bandwidth and 9.3-dB Peak-to-Average Power Ratio (PAPR), the Doherty amplifier achieved an average efficiency around 50% with an Adjacent Channel Power Ratio (ACPR) lower than -38-dBc. Similar performances have been registered using a signal with 48-MHz bandwidth and 10.3-dB PAPR.
Giofre', R., Piazzon, L., Colantonio, P., Giannini, F. (2013). A Doherty amplifier with maximally flat efficiency in the bandwidth. In Microwave Symposium Digest (IMS), 2013 IEEE MTT-S International (pp.1-3) [10.1109/MWSYM.2013.6697335].
A Doherty amplifier with maximally flat efficiency in the bandwidth
GIOFRE', ROCCO;PIAZZON, LUCA;COLANTONIO, PAOLO;GIANNINI, FRANCO
2013-01-01
Abstract
This contribution presents a creative circuit level solution to improve the efficiency versus frequency response of the Doherty amplifier. The proposed approach is compared with the conventional one and experimentally validated through a practical prototype realization based on GaN-HEMTs. Continuous wave measurements have shown a 65%-51% efficiency at about 42-36.5-dBm output power from 1.95-GHz to 2.25-GHz. When tested with a mobile WiMAX signal with 5MHz bandwidth and 9.3-dB Peak-to-Average Power Ratio (PAPR), the Doherty amplifier achieved an average efficiency around 50% with an Adjacent Channel Power Ratio (ACPR) lower than -38-dBc. Similar performances have been registered using a signal with 48-MHz bandwidth and 10.3-dB PAPR.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
