Digital Quadrature Spatial Combining: An Efficient mm-Wave Beamforming

Transmitter

Jiashu Chen, Lu Ye, Ali M. NiknejadUniversity of California, Berkeley

Berkeley Wireless Research CenterFeb. 14th, 2013 BEARS

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Emerging mm-Wave Applications

REF: WiGig

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“Digital” Transmitters

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Digital Quadrature Spatial Combining

• Non-isolating combiner Low loss× Significant I/Q crosstalk

• Isolating combiner No I/Q crosstalk× Insertion loss

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WiGig Prototype Demonstration

CW ModePeak EIRP (dBm) 22

PA peak efficiency (%) 28.56dB Backoff (Transmission Mode)

PA average efficiency (%) 16.5Peak data rate (Gb/s) 6

EVM (dB) -16.2