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- Title
A Fully Integrated Compact Outphasing CMOS Power Amplifier Using a Parallel-Combining Transformer with a Tuning Inductor Method.
- Authors
Choi, Se-Eun; Ahn, Hyunjin; Hur, Joonhoi; Kim, Kwan-Woo; Nam, Ilku; Choi, Jaehyouk; Lee, Ockgoo
- Abstract
This work presents a compact on-chip outphasing power amplifier with a parallel-combining transformer (PCT). A series-combining transformer (SCT) and PCT are analyzed as power-combining transformers for outphasing operations. Compared to the SCT, which is typically used for on-chip outphasing combiners, the PCT is much smaller. The outphasing operations of the transformer combiners and class-D switching PAs are also analyzed. A tuning inductor method is proposed to improve the efficiency of class-D power amplifiers (PAs) with power-combining transformers in the out-of-phase mode. The proposed PA was implemented with a standard 0.18 µm CMOS process. The measured maximum drain efficiency is 37.3% with an output power of 22.4 dBm at 1.7 GHz. A measured adjacent channel leakage ratio (ACLR) of less than −30 dBc is obtained for a long-term evolution (LTE) signal with a bandwidth of 10 MHz.
- Subjects
POWER amplifiers; CMOS amplifiers; LONG-Term Evolution (Telecommunications)
- Publication
Electronics (2079-9292), 2020, Vol 9, Issue 2, p257
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics9020257