Four-antenna path beamforming CMOS transceiver supports up to 4.62Gbps
The transceiver is a breakthrough in developing a small, low-cost, and low power solution for multi-gigabit communication targeting WiGig as well as 60GHz wireless backhaul applications. Imec’s and VUB’s 60GHz transceiver architecture features direct conversion and analog baseband beamforming with four antennas.
The researchers say the architecture is inherently simple and is not affected by image frequency interference. A 24GHz phase-locked loop that sub-harmonically locks a 60GHz quadrature oscillator is inherently immune to the pulling disturbance of the 60GHz power amplifier, they add.
The prototype transceiver chip, only 7.9sqmm is implemented in 28nm CMOS and integrates a four-antenna array. The chip was validated with a IEEE 802.11ad standard wireless link of 1m. The transmitter consumes 670mW and the receiver 431mW at 0.9V power supply. The transmitter-to-receiver EVM was better than -20dB in all the four WiGig frequency channels (58.32, 60.48, 62.64 and 64.8 GHz), with a transmitter equivalent isotropic radiated power (EIRP) of 24dBm. This allows for QPSK as well as 16QAM modulations according to the IEEE 802.11ad standard, achieving very high data rates up to 4.62 Gbps.
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