250 W HVHBT Doherty With 57% WCDMA Efficiency Linearized to ${-}$55 dBc for 2c11 6.5 dB PAR

A High-Efficiency 100-W GaN Three-Way Doherty Amplifier for Base-Station Applications

“…2 with DPA results found in the literature [15], [18], we can conclude that most conventional DPA implementations with a passive input power splitter use phase relations, which are optimized for high efficiency at the maximum output power condition.…”

“…A state-of-the-art envelope tracking amplifier is demonstrated in [2] offering a power-added efficiency (PAE) of 50.7% for a wideband code division multiple access (W-CDMA) signal, at an average output power of 37.2 W (in [2], the W-CDMA signal was clipped in order to reduce the crest factor to 7.67 dB). A comparable performance is very recently achieved with a two-way Doherty power amplifier (DPA) [15] where, for a W-CDMA signal (with 50-W average output power), a PAE of 53% has been achieved. Decresting is also used here to reduce the crest factor to 6.5 dB.…”

A 460 MHZ Doherty Amplifier for Imt-Advanced System

“…But the peaking PA is biased in a class-C condition, resulting in VDS = 28 V and VGS = 2.0 V. And the Z opt is matched to 50 Ω to operate in its full capacity [16]. The complete peaking PA comprises the offset line to prevent power leakage and compensate phase delay [17].…”

Advanced Microwave Circuits and Systems

“…As will be later detailed, the OBO value represents the first parameter to be chose in the design process. (Kim et al, 2008-Lee et al, 2008-Markos et al, 2007-Kim et al, 2005, whereas 50% of drain efficiency has been demonstrated for 250W output power (Steinbeiser et al, 2008). Also for high frequency applications the DPA has been successfully implemented using GaAs MMIC technologies (McCarroll et al, 2000-Campbell, 1999.…”