Richard Hellberg
Ericsson
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Publication
Featured researches published by Richard Hellberg.
international microwave symposium | 2013
David Gustafsson; Christer M. Andersson; Richard Hellberg; Christian Fager
In this paper we present a 1.0-3.0 GHz GaN power amplifier with significant back-off power added efficiency (PAE) enhancement. The design of the PA, which has two digitally controlled RF inputs, was derived from a practical combining network without assuming any idealized conditions at the higher harmonics. By using linear multi-harmonic calculations, a GaN PA design was optimized for high efficiency with a 6.7 dB peak to average power ratio (PAPR) WCDMA signal over 108% fractional bandwidth. Measurements on the assembled circuit demonstrated 44 ± 0.9 dBm maximum output power, and a drain efficiency and PAE at 6 dB output power back-off (OPBO) larger than 48% and 45%, respectively.
Archive | 2002
Richard Hellberg; Mats Klingberg
Archive | 2003
Richard Hellberg
Archive | 2002
Richard Hellberg; Mats Klingberg
Archive | 2001
Richard Hellberg
Archive | 2002
Richard Hellberg
Archive | 2000
Anders Wedin; Richard Hellberg
Archive | 1997
Richard Hellberg
Archive | 1998
Richard Hellberg
IEEE Transactions on Microwave Theory and Techniques | 2013
Christer M. Andersson; David Gustafsson; Jessica Chani Cahuana; Richard Hellberg; Christian Fager
