A 6–18-GHz GaN Reactively Matched Distributed Power Amplifier Using Simplified Bias Network and Reduced Thermal Coupling
| Autor: | Hyosung Nam, Youngwoo Kwon, Junghyun Kim, Kwangseok Choi, Hongjong Park |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Radiation
Materials science business.industry Amplifier 020208 electrical & electronic engineering Transistor Distributed amplifier 020206 networking & telecommunications Biasing Gallium nitride 02 engineering and technology High-electron-mobility transistor Condensed Matter Physics Cutoff frequency law.invention chemistry.chemical_compound chemistry law 0202 electrical engineering electronic engineering information engineering Optoelectronics Electrical and Electronic Engineering business DC bias |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 66:2638-2648 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2018.2817521 |
| Popis: | Two-stage reactively matched gain cells are proposed to implement a high-gain multioctave distributed power amplifier (DPA). The proposed reactively matched distributed amplifier (RMDA) structure shows high gain and power in a small die size. Detailed analysis is presented to understand the design criteria for interstage matching of reactively matched cells. A shared dc bias network is proposed to simplify the biasing of each section to reduce the DPA die size. The thermal coupling effect of GaN high-power amplifier is minimized by optimizing the chip layout. The theoretical analysis is verified by the simulation and supported by the measured data. Two RMDAs are fabricated with a commercial 0.25- $\mu \text{m}$ GaN HEMT process. The implemented RMDA with the compact transistor layout has been implemented in a small die size of 10.7 mm2 and shows output powers reaching 40.3–43.9 dBm, power added efficiencies (PAEs) of 16–27%, and small-signal gains of 15.3–23.2 dB. The RMDA with the reduced thermal coupling achieves 40.6–43.4 dBm with a peak PAE of 29% in a slightly larger die size of 13.8 mm2. To the best of our knowledge, this is the first demonstration of a GaN DPA using reactively matched gain cells, showing very high gain and efficiency over multioctave bandwidth in a small die size. |
| Databáze: | OpenAIRE |
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