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A Wideband and Compact GaN MMIC Doherty Amplifier for Microwave Link Applications

David Gustafsson (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Jessica Chani Cahuana (Institutionen för signaler och system, Kommunikationssystem) ; Dan Kuylenstierna (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Iltcho Angelov (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Niklas Rorsman (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Christian Fager (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik)
Ieee Transactions on Microwave Theory and Techniques (0018-9480). Vol. 61 (2013), 2, p. 922-930.
[Artikel, refereegranskad vetenskaplig]

This paper addresses the limitations and difficulties, in terms of DC-current density restrictions, and process limitations, associated with implementing impedance inverters with high characteristic impedance for monolithic microwave integrated circuit (MMIC) Doherty power amplifiers (DPAs). It is theoretically shown that impedance inverters with high characteristic impedance can be realized by utilizing the output capacitance of the active devices, together with a compact Tee-network of transmission lines with feasible linewidths. The utility of the impedance inverter is proven by design and fabrication of a GaN MMIC-DPA for microwave link applications. Continuous wave (CW) measurements demonstrate a maximum output power of 35 +/- 0.5 dBm over a frequency range of 6.6-8.5 GHz. The power added efficiency (PAE) in 9 dB output power back-off (OPBO) is better than 30% in a frequency range of 6.7-7.8 GHz. Moreover, linearized modulated measurements, employing a 10 MHz 256-QAM signal with 7.8 dB peak to average power ratio (PAPR), demonstrate higher than 35% average PAE, with 27.5 +/- 0.2 dBm average output power, and an adjacent channel power ratio (ACPR) less than -45 dBc, across a 6.8-8.5 GHz frequency range. The fabricated chip-size measures 2.1 mm x 1.5 mm.

Nyckelord: Broadband amplifiers, Doherty, gallium nitride, GaN, high efficiency, microwave, MMIC, power, high-efficiency



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Denna post skapades 2013-03-19. Senast ändrad 2015-12-17.
CPL Pubid: 174823

 

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