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Symmetrical doherty amplifier with high efficiency over large output power dynamic range

Mustafa Özen (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
2014 IEEE MTT-S International Microwave Symposium, IMS 2014; Tampa, FL; United States; 1 June 2014 through 6 June 2014 (0149-645X). (2014)
[Konferensbidrag, refereegranskat]

For the conventional Doherty power amplifiers, asymmetrical cells are used to achieve high efficiency over large (> 6 dB) output power dynamic ranges, i.e. larger class-C cell. In this paper, it will be theoretically proven that high efficiency over large dynamic ranges also can be achieved using symmetrical devices, while still maintaining full voltage and current swing of both transistor cells. Using a smaller class-C cell compared to the asymmetrical Doherty has the advantages of higher gain and power added efficiency (PAE). The proposed symmetrical Doherty concept is experimentally verified by a 3.5 GHz 28 Watt circuit demonstrator fabricated using identical GaN HEMT devices. An average power added efficiency of 52% and adjacent power leakage ratio of -52 dB is obtained with 9 dB peak-to-average power-ratio 20 MHz LTE test signals.

Nyckelord: combiner synthesis , Doherty PA , efficiency

Denna post skapades 2014-08-21. Senast ändrad 2015-12-17.
CPL Pubid: 201756


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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik



Chalmers infrastruktur