A concurrent 2.15/3.4 GHz dual-band Doherty power amplifier with extended fractional bandwidth
| Autor: | Hamed Golestaneh, Slim Boumaiza, Mingming Liu |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
business.industry Amplifier 020208 electrical & electronic engineering RF power amplifier Bandwidth (signal processing) Electrical engineering Power bandwidth 020206 networking & telecommunications 02 engineering and technology Fully differential amplifier 0202 electrical engineering electronic engineering information engineering Electronic engineering Linear amplifier business Doherty amplifier Direct-coupled amplifier |
| Zdroj: | 2016 IEEE MTT-S International Microwave Symposium (IMS). |
| Popis: | A novel output-combining network for a concurrent dual-band Doherty power amplifier (DPA) is proposed. The proposed output combiner employs a modified ?-network, which enables the absorption of main and peaking transistors' output parasitics over an extended frequency range and eliminates the need for offset lines that compromise the achievable bandwidth. In addition to performing the impedance inversion, the proposed combiner incorporates the biasing feeds and presents small low-frequency impedances to both transistors in order to improve the DPA linearizability when driven with concurrent dual-band modulated signals. A 50-W dual-band DPA demonstrator was successfully designed to operate across two bands, 2.05–2.30GHz and 3.2–3.62GHz. It achieved greater than 49% and 47% drain efficiency at a 6-dB output back-off over the two bands, and was successfully linearized under single and dual-band modulated signal stimuli. |
| Databáze: | OpenAIRE |
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