Design of a Phased Array Receiver for 5G Applications

Tahbaz Alli, Parsa | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54973 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sharif Bakhtiar, Mehrdad
  7. Abstract:
  8. Next-generation wireless communication requires phased-array systems to ensure Gb/s data communication. This work demonstrates a four-element phased array receiver based on N-path filters for the 5G-FR1 frequency band. The behaviour of the circuit including non-idealities and effects due to mismatch in the paths is modeled and verified via simulations. As the time-variant nature of the N-path filter introduces multiple frequency translations, third harmonic selection of the switching frequency rather than the fundamental helps to reduce the input frequency of the multiphase clock generator by a factor of three. Therefore, the proposed structure is capable of third harmonic reception as well as fundamental harmonic reception by utilizing a harmonic-recombination structure. The proposed structure is realized in 65nm CMOS technology and operates from a 1.2 V supply. Eight phases of the clock signals are generated using a clock divider, resulting in a raw beam-forming accuracy of 3 bits. Post-layout simulations show a single element noise figure of <4.9 dB and IIP3 of better than -13.5 dBm over the whole band for fundamental harmonic reception. Noise figure and IIP3 for third harmonic reception are <6.1 dB and >-8.7 dBm, respectively. The receiver provides a maximum single-element gain of 31.2 dB and 23.2 dB for fundamental and third harmonic reception, respectively. The harmonic recombination may be calibrated to achieve true harmonic rejection. A third harmonic rejection ratio of 49 dB and a fundamental harmonic rejection ratio of 43 dB are attained. The total power consumption of the chip is less than 115 mW while occupying a silicon area of 0.84 mm2 including all pads
  9. Keywords:
  10. N-Path Filter ; Spatial Filtering ; Beamforming ; Fifth Generation of Mobile Networks ; Local-Oscillator Phase Shifting ; Integrated Phased Array Receiver

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