A 28 nm CMOS 7.04 Gsps polar digital front-end processor for 60 GHz transmitter

A complete Digital Front-End (DFE) processor for 60 GHz polar transmitter is presented. It avoids supply modulating, RF limiters, and AM detection circuits, compared to traditional analog-centric polar transmitter architectures. The front-end processor consists of i) a poly-phase Cascaded Integrator-Comb (CIC) filter for spectrum shaping; ii) parallel COordinate Rotation DIgital Computer (CORDICs) for rectangular-to-polar conversion; and iii) Power Amplifier (PA) non-linearities pre-distortion units using Look-Up Tables (LUTs). It is designed in two-phase latch-based pipeline to achieve a throughput of 4×1.76 Gsps. Implemented in a standard 28 nm CMOS technology, the DFE processor occupies 0.031 mm2 and consumes 39mW from 0.9V supply. This result outperforms previously reported architectures.

[1]  Ali M. Niknejad,et al.  A 7-Bit 18th Order 9.6 GS/s FIR Up-Sampling Filter for High Data Rate 60-GHz Wireless Transmitters , 2012, IEEE Journal of Solid-State Circuits.

[2]  <30 mW rectangular-to-polar conversion processor in 802.11ad polar transmitter , 2015, 2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[3]  Paul T. M. van Zeijl,et al.  A Digital Envelope Modulator for a WLAN OFDM Polar Transmitter in 90 nm CMOS , 2007, IEEE Journal of Solid-State Circuits.

[4]  Imran Bashir,et al.  A 0.8mm2 all-digital SAW-less polar transmitter in 65nm EDGE SoC , 2010, 2010 IEEE International Solid-State Circuits Conference - (ISSCC).

[5]  Yanxiang Huang,et al.  A 13 bits 4.096 GHz 45 nm CMOS digital decimation filter chain with Carry-Save format numbers , 2015, Microprocess. Microsystems.

[6]  Chunshu Li,et al.  Digitally Modulated CMOS Polar Transmitters for Highly-Efficient mm-Wave Wireless Communication , 2016, IEEE Journal of Solid-State Circuits.

[7]  D. De Caro,et al.  A 430 MHz, 280 mW Processor for the Conversion of Cartesian to Polar Coordinates in 0.25 $\mu\hbox{m}$ CMOS , 2008, IEEE Journal of Solid-State Circuits.

[8]  Antonio G. M. Strollo,et al.  A 430 MHz, 280 mW Processor for the Conversion of Cartesian to Polar Coordinates in 0.25 µm CMOS , 2008, IEEE J. Solid State Circuits.

[9]  Alan N. Willson,et al.  A 400-MHz processor for the conversion of rectangular to polar coordinates in 0.25-μm CMOS , 2003, IEEE J. Solid State Circuits.