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- Title
Wideband phase inverter integrated in Doherty power amplifier for linearity improvement.
- Authors
Mung, S. W. Y.; Chan, W. S.
- Abstract
A wideband phase inverter (WPI) integerated in a Doherty power amplifier (DPA) is proposed for linearity improvement. This WPI is integrated at the output of the carrier amplifier in the DPA while keeping the same size as the conventional DPA. The input signal is excited at both the carrier and the peaking amplifiers and then the amplified signals are combined by the push-pull toplogy. This results in the cancellation of the even-order harmonic terms as well as the cancellation of IMD3 by proper bias selection. An experiment shows the peak power-added efficiency (PAE) is around 50% at 21 dBm output power with linearity improvement as the adjacent channel leakage ratio (ACLR) under a wideband code division multiple access signal is around -40 dBc. This improves around 7 dB in ACLR under the same output power and PAE and better error vector magnitude (EVM) compared with the single-stage class AB amplifier.
- Subjects
POWER amplifiers; BROADBAND communication systems; ELECTRICAL harmonics; HARMONIC suppression filters; ELECTRIC waves
- Publication
Electronics Letters (Wiley-Blackwell), 2015, Vol 51, Issue 10, p771
- ISSN
0013-5194
- Publication type
Article
- DOI
10.1049/el.2015.0393