In this paper, a theoretical investigation of the causes of the AM/PM distortion in Doherty Power Amplifiers is presented for the first time. The distortion sources are identified and a solution to mitigate the AM/PM conversion through the input termination of the Carrier amplifier is also highlighted. The relevant analysis is carried out using a simplified model of the active device and validated by means of full nonlinear model of a commercial GaN HEMT transistor. The role of the Miller effect in such a kind of distortion is stressed, demonstrating the existing link between output load modulation and phase distortion.
Piazzon, L., Giofre', R., Colantonio, P., Giannini, F. (2014). Investigation of the AM/PM distortion in Doherty power amplifiers. In 2014 IEEE radio and wireless symposium: 19–22 January 2014 Newport Beach, California, USA (pp.7-9). IEEE [10.1109/PAWR.2014.6825729].
Investigation of the AM/PM distortion in Doherty power amplifiers
PIAZZON, LUCA;GIOFRE', ROCCO;COLANTONIO, PAOLO;GIANNINI, FRANCO
2014-01-01
Abstract
In this paper, a theoretical investigation of the causes of the AM/PM distortion in Doherty Power Amplifiers is presented for the first time. The distortion sources are identified and a solution to mitigate the AM/PM conversion through the input termination of the Carrier amplifier is also highlighted. The relevant analysis is carried out using a simplified model of the active device and validated by means of full nonlinear model of a commercial GaN HEMT transistor. The role of the Miller effect in such a kind of distortion is stressed, demonstrating the existing link between output load modulation and phase distortion.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
