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A 3.5GHz CMOS Transceiver for Sub-6GHz and Mm-Wave Co-Existed 5G Communication Systems

This paper presents a 3.5GHz CMOS transceiver for 5G communication, which is compatible for millimeter-wave phased array IF conversion and Sub-6GHz communication. A variable gain power amplifier (VGPA) and a variable gain low noise amplifier (VGLNA) are included in transmitter and receiver, respectively, achieving high resolution gain control. Configurable RF path and LO source extend the compatibility of the transceiver. The transmitter shows measured maximum gain of 23.1dB and peak output power of 9.8dBm in 3.5GHz. The receiver shows measured maximum gain of 30dB and noise figure of 6.3dB in 3.5GHz. Both realize a gain resolution of about 1dB. The transceiver is fabricated in 65-nm CMOS technology with a chip size of 3.1×2.3 mm2 including ESD protection circuit.