Accession Number : AD1041390


Title :   Analog 65/130 nm CMOS 5 GHz Sub-Arrays with ROACH-2 FPGA Beamformers for Hybrid Aperture-Array Receivers


Descriptive Note : Conference Paper


Corporate Author : University of Akron Akron United States


Personal Author(s) : Ariyarathna,Viduneth ; Udayanga,Nilan ; Madanayake,Arjuna ; Belostotski,Leonid ; Ahmadi,Peyman ; Mandal,Soumyajith ; Nikoofard,Ali


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1041390.pdf


Report Date : 20 Mar 2017


Pagination or Media Count : 4


Abstract : 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 circuit(RF-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.


Descriptors :   complementary metaloxide semiconductors , field programmable gate arrays , energy consumption , bandwidth , antennas , discrete fourier transforms , low noise amplifiers , narrowband , radio frequency , acoustic absorption , algorithms , integrated circuits , filters , angle of arrival , frequency


Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE