A 60 GHz wideband active balun using magnitude and phase concurrent correction technique in 65nm CMOS

A wideband magnitude and phase concurrent correction technique (MPCCT) is proposed in this paper. The MPCCT can concurrently correct the gain and phase imbalances between the differential signals of an active balun. This technique employs positive feedback and negative feedback as correction circuits. The two feedback loops redistribute the gain and phase imbalances into the differential outputs equally. The balun using MPCCT has the measured maximum gain 6.1dB at 59 GHz while the gain and phase imbalances are 0.14 dB and 0.7° respectively. The bandwidth of the balun is 12 GHz. The measured results demonstrate the robust correction at millimeter-wave (MMW) frequency. The power consumption is 11.6mW with 1V supply voltage and the chip area is 0.26 mm² excluding the pads.