| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
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| Outline of Final Research Achievements |
In order to realize an arrayed cascode linear Doherty amplifier, we designed and fabricated an independent bias type InGaP / GaAs HBT three-stage cascode MMIC and AlGaN / GaN HEMT three-stage cascode MMIC as a basic cell structure. In HBTMMIC, the power gain was improved by more than 10 dB, the isolation was improved by more than 23 dB, and it was confirmed experimentally that the power efficiency characteristic and the distortion characteristic can be optimized and adjusted independently as compared with the nonindependent bias type. The same effect was confirmed with HEMT MMIC. We constructed Doherty amplifiers using two such cells, and the improvement of the power added efficiency was confirmed by simulation in the area of output backoff of 5 dB or more, and the effectiveness of this method was shown.
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