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A true enhancement-mode junction pseudomorphic HEMT (JPHEMT) with a high threshold voltage (V/sub th/) Of +0.5 V was developed for single-supply power amplifiers. The novel JPHEMT exhibits an extremely low standby leakage current. The leakage current at 25/spl deg/C is 2.2/spl times/10/sup -10/ A/mm and even at 85/spl deg/C is 8.6/spl times/10/sup -9/ A/mm.(More)
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