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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Andersson, C.M. Ozen, M. Gustafsson, D. Yamanaka, K. Kuwata, E. Otsuka, H. Nakayama, M. Hirano, Y. Angelov, I. Fager, C. Rorsman, N. |
| Copyright Year | 2013 |
| Description | Author affiliation: Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kamakura, Japan (Yamanaka, K.; Kuwata, E.; Otsuka, H.; Nakayama, M.; Hirano, Y.) || Microwave Electron. Lab., Chalmers Univ. of Technol., Goteborg, Sweden (Andersson, C.M.; Ozen, M.; Gustafsson, D.; Angelov, I.; Fager, C.; Rorsman, N.) |
| Abstract | Output power scaling based on class-J dynamic load modulation (DLM) theory is used to design an unprecedentedly high power microwave transmitter with varactor-based DLM functionality. Matching networks are realized on high dielectric constant substrates in order to reduce the form factor. The fully matched DLM PA incorporates a 24-mm GaN HEMT powerbar and a stack of four SiC varactors, all fit into a CuW package (40 mm × 20 mm). Peak output power is reconfigurable by changing the drain voltage, while retaining the DLMeffect. Under pulsed conditions at 40 V the PA delivers a peak power of 86 W at 2.14 GHz. Efficiency enhancement by DLM is 10-15 percentage-units at 6 dB output power back-off (OPBO). Employing digital predistortion (DPD) with a vector switched generalized memory polynomial (VS-GMP) the ACLR is -46 dBc at an average output power of 17 W and a drain efficiency of 34%. These results prove the potential for high output power levels in varactor-based DLM transmitters. |
| Starting Page | 283 |
| Ending Page | 286 |
| File Size | 878128 |
| Page Count | 4 |
| File Format | |
| ISBN | 9782874870316 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-10-06 |
| Publisher Place | Germany |
| Access Restriction | Subscribed |
| Rights Holder | European Microwave Association |
| Subject Keyword | Varactors Power generation Substrates Transmitters Transistors Microwave theory and techniques Modulation varactors Gallium nitride high efficiency power amplifiers silicon carbide |
| Content Type | Text |
| Resource Type | Article |
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