A low-loss broadband quadrature signal generation network for high image rejection at millimeter-wave frequencies

Frounchi, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1109/TMTT.2018.2869584
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2018
  4. Abstract:
  5. This paper presents a broadband low-loss quadrature-hybrid-based network that enhances the phase and the amplitude matching of quadrature signals. The performance of this network is investigated, and a detailed theoretical analysis is provided. Several stages of this network can be cascaded to generate broadband balanced quadrature signals. Each stage has a loss of 0.5 dB and enhances the image rejection ratio (IRR) by approximately 8 dB. Compared with the conventional polyphase quadrature signal generation methods, the proposed network enables lower insertion loss, wider bandwidth, and reduced sensitivity to process variations. To verify the theoretical analyses, two proof-of-concept image-reject mixers are implemented in a 0.13-μm SiGe BiCMOS technology. The first mixer achieves an average IRR of 37.5 dB across 40-76 GHz, whereas the second mixer achieves an average IRR of 33.5 dB across 40-102 GHz. The proposed network is a promising solution for broadband quadrature signal generation at millimeter-wave frequencies, as it eliminates the need for calibration and tuning. IEEE
  6. Keywords:
  7. Bandwidth ; Broadband communication ; Coupled-line coupler (CLC) ; Couplers ; Image rejection (IR) ; In-phase/quadrature-phase (I/Q) transceiver ; IR mixer ; Millimeter wave (mm-wave) ; Mixers ; Polyphase ; Quadrature hybrid (QH) ; RLC circuits ; Silicon-germanium ; Bismuth alloys ; Frequency shift keying ; Image enhancement ; Mixers (machinery) ; Resonant circuits ; Sensitivity analysis ; Si-Ge alloys ; Signal generators ; Waveguide couplers ; Coupled-line couplers ; Image rejection ; In-phase/quadrature-phase ; Millimeter-wave (mm-wave) ; Quadrature generation ; Quadrature hybrids ; RLC circuit ; Sideband suppression ; SiGe ; Silicon Germanium ; Millimeter waves
  8. Source: IEEE Transactions on Microwave Theory and Techniques ; 2018 ; 00189480 (ISSN)
  9. URL: https://ieeexplore.ieee.org/abstract/document/8474937