A Wideband and Compact GaN MMIC Doherty Amplifier for Microwave Link Applications
Artikel i vetenskaplig tidskrift, 2013

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.

Doherty

high efficiency

Broadband amplifiers

MMIC

GaN

high-efficiency

microwave

power

gallium nitride

Författare

David Gustafsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Jessica Chani Cahuana

Chalmers, Signaler och system, Kommunikationssystem, informationsteori och antenner, Kommunikationssystem

Dan Kuylenstierna

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Iltcho Angelov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Niklas Rorsman

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

Christian Fager

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 61 922-930

Styrkeområden

Informations- och kommunikationsteknik

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1109/TMTT.2012.2231421