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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Dani, A. Coffey, M. Popovie, Z. |
| Copyright Year | 2014 |
| Description | Author affiliation: Dept. of Electr., Comput., & Energy Eng., Univ. of Colorado, Boulder, CO, USA (Dani, A.; Coffey, M.; Popovie, Z.) |
| Abstract | This paper demonstrates a MMIC GaN X-band PA designed to have improved efficiency by second harmonic power injection at the output that helps shape the time-domain waveforms across the drain. The MMIC contains a class-AB PA with a nominal 4-W (36 dBm) output power at 10GHz and a small-signal gain of 14dB. The best results with harmonic injection were measured at 10.6 GHz with 3.5W (35.44 dBm) of output, showing an increase in drain efficiency from 48.5% without injection to 70% when 26.2 dBm was injected at 21.2 GHz. In order to maximize the total efficiency, which includes the efficiency of the injection circuit, a second harmonic efficient amplifier is integrated in the same GaN MMIC. The 20-GHz PA needs to provide a power on the order of $P_{out}$ - 10dB, and is measured to output 27dBm with 8dB gain and PAE=59%. The relationship between the total efficiency and injector efficiency is derived and shows that the total efficiency is not appreciably affected by the injector efficiency if a second-harmonic amplifier with a gain greater than 6-7dB and with a PAE > 40% is employed. |
| Starting Page | 389 |
| Ending Page | 392 |
| File Size | 374766 |
| Page Count | 4 |
| File Format | |
| ISBN | 9782874870361 |
| DOI | 10.1109/EuMIC.2014.6997874 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-10-06 |
| Publisher Place | Italy |
| Access Restriction | Subscribed |
| Rights Holder | European Microwave Association - EUMA |
| Subject Keyword | MMICs X-band Harmonic analysis Microwave circuits harmonic injection drain efficiency Gain Power generation MMIC |
| Content Type | Text |
| Resource Type | Article |
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