Low-cost, low-power chip for multi-gigabit 60 GHz communication
The transceiver is a breakthrough in developing a small, low-cost, and low power chip for multi-gigabit communication targeting WiGig® as well as 60 GHz wireless backhaul applications.
Due to the tremendous growth of mobile data traffic, display and audio applications, new spectral resources in the mm-wave frequency bands are needed to support user demand for high data rates. One way to realize this is through mm-wave wireless networks based on small outdoor cells featuring beamforming, a signal processing technique using phased antenna arrays for directional transmission or reception. The beamforming steers the radiation in the desired direction while achieving a good link budget that supports high spectral efficiency.
The 60 GHz transceiver architecture features direct conversion and analog baseband beamforming with four antennas. The architecture is inherently simple and is not affected by image frequency interference. Moreover, a 24 GHz phase-locked loop that subharmonically locks a 60 GHz quadrature oscillator is inherently immune to the pulling disturbance of the 60 GHz power amplifier.
The prototype transceiver chip (7,9 mm2), implemented in 28nm CMOS, integrates a four-antenna array. The chip was validated with a IEEE 802.11ad standard wireless link of 1m. The transmitter consumes 670 mW and the receiver 431 mW at 0.9 V power supply. The transmitter-to-receiver EVM was better than -20 dB 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 24 dBm. 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.