Analog 65/130 nm CMOS 5 GHz Sub-Arrays with ROACH-2 FPGA Beamformers for Hybrid Aperture-Array Receivers
University of Akron Akron United States
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Analog-digital hybrid aperture array receiver is proposed towards reducing the analog-to-digital converters ADC power consumption and circuit complexity of a fully digital array. Proposed system consists of a Nyquist sampled analog sub-array level-1 followed by an under sampled digital beam former level-2. Two alternatives for the level-1analog sub-array are discussed. In the first approach, a voltage controlled all-pass filter is realized using 130 nm CMOS technology and having more than 5 GHz bandwidth, is used as the true-time delay element to obtain electronically steerable analog beams. Prototype radio frequency integrated circuitRF-IC implementation of a 4-element wideband analog sub-array, which is based on all-pass filters APFs is realized using 130 nm CMOS technology. Approximate-discrete Fourier transform a-DFT algorithm based multi-beam architecture is proposed as the second approach for thelevel-1 analog sub-array. An 8-point a-DFT multi-beam array using 65 nm CMOS technology supports 4GHz of bandwidth. The level-2 digital beamforming occurs in the ROACH-2FPGA platform. Array factor measurements are provided for several frequency and beam direction combinations.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation