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A monolithic transformer balun has been designed for 60 GHz applications. The balun is implemented based on GLOBALFOUNDRIES 65 nm CMOS process. Simulated amplitude and phase imbalance less than 0.1 dB and 0.34 degrees respectively over the 55-66 GHz frequency band are achieved. Insertion loss is as low as 1.22 dB at 60 GHz. The designed device has advantage of small size, low loss and excellence in output balance.