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A fully-integrated power amplifier for 1.5–2.9 GHz was realised in a 28 GHz-fT SiGe-bipolar technology. No external components are required owing to the novel power-combining transformer structure. An output power of 32.3 dBm with a power added efficiency over 30% is achieved at 3.5 V.
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Vasylyev et al. (2005) studied this question.
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