@inproceedings{bc5e307a3eb7406d96f71168d0a6d592,
title = "The efficiency improvement of a compact inverted doherty amplifier using bias line adjustment",
abstract = "We describe our proposal of an efficiency improvement method for a compact inverted Doherty amplifier using a bias line adjustment. In order to compensate for the capacitive parasitic components of the high-power transistors, we adjusted a λ/4 bias line to have an inductive impedance value. The inductive bias line made parallel resonance with the capacitive internal component. The following matching network and offset line rotated the output reflection coefficient (ΓOUT) to almost -1, which was desirable for the compact inverted Doherty amplifier design. The optimum length of the bias line was found after some adjustments. Compared to the Doherty amplifier using a λ/4 bias line, the proposed Doherty amplifier using an adjusted bias line provided improved power-added efficiencies (PAEs) of 6 \% and 4 \% points for a two-tone signal at an output power of 45 dBm and for the π/4-DQPSK signal at an output power of 47 dBm, respectively.",
keywords = "Doherty amplifier, High-power amplifier, Inverted Doherty amplifier, Parasitic components, Quarter-wave line",
author = "Kim, \{Min Su\} and Hanjin Cho and Ahn, \{Gun Hyun\} and Park, \{Hyun Chul\} and Jung, \{Sung Chan\} and Van, \{Ju Ho\} and Jonghyuk Jeong and Lim, \{Kyung Hoon\} and Kwon, \{Sung Wook\} and Kim, \{Jae Young\} and Song, \{Sung Chan\} and Park, \{Cheon Seok\} and Youngoo Yang",
year = "2007",
doi = "10.1109/APMC.2007.4554959",
language = "English",
isbn = "1424407494",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
booktitle = "2007 Asia-Pacific Microwave Conference, APMC",
note = "Asia-Pacific Microwave Conference, APMC 2007 ; Conference date: 11-12-2007 Through 14-12-2007",
}