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A Single-Path Reconfigurable Frequency Multiplier for 28/39 GHz Dual-Band Transceivers

This paper presents a single-output frequency multiplier, operating either as doubler or tripler for LO generation in 5G dual-band transceivers. The multiplier consists of differential pair, followed by a wideband 1-bit phase shifter that enables summation/cancellation of odd or even current harmonics. A frequency-reconfigurable driver amplifier, based on variable transmission lines, is integrated to boost the output power and signal purity. The multiplier can generate frequencies in the range of 21-23 GHz and 31.5-34.5 GHz with output power>2 dBm with a fixed 5 dBm input, while maintaining harmonic rejection of over 25 dBc. The IC is implemented in 120 nm SiGe BiCMOS process, occupies area of 0.63 mm2 and consumes 60 mW.