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A V‐band frequency quadrupler with high output power characteristic has been implemented and fabricated using 0.15 µm GaAs pHEMT technology. This quadrupler circuit is achieved by a second‐order subharmonic injection‐locked oscillator and a push–push frequency doubler as the output buffer. The free‐running oscillation frequency of the core oscillator is around 35 GHz with a tuning range of 3.25 GHz...
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