A digitally modulated mm-Wave cartesian beamforming transmitter with quadrature spatial combining
ISSCC(2013)
Abstract
With fast-growing demand for high-speed mobile communications and highly saturated spectral usage below 10GHz, mm-Wave frequency bands are emerging as the key playground for future high-data-rate wireless standards. Recent years have witnessed vast technology development on V-band (60GHz) Wireless Personal Area Networks (WPAN) and E-band (80GHz) point-to-point cellular backhauls. However, existing integrated CMOS mm-Wave solutions have relatively poor energy efficiency, especially for the transmitter (TX). This is mainly due to the use of traditional Class-A Power Amplifiers (PAs) that provide good linearity but suffer from low efficiency. In addition, the efficiency of Class-A PAs drop dramatically at power back-offs, making these transmitters even less efficient when conveying non-constant envelope signals. State-of-the-art mm-Wave Class-A PAs show less than 5% efficiency at 6dB back-off [1,2].
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Key words
mm-wave frequency bands,nonconstant envelope signals,high-speed mobile communications,radio transmitters,telecommunication standards,cellular radio,v-band wireless personal area networks,digitally modulated mm-wave cartesian beamforming transmitter,quadrature spatial combining,class-a power amplifiers,frequency 80 ghz,high-data-rate wireless standards,power back-offs,wpan,frequency 60 ghz,pa,e-band point-to-point cellular backhauls,millimetre wave amplifiers
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