A Highly Linear Receiver Using Parallel Preselect Filter for 5G Microcell Base Station Applications

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Abstract

By introducing three different techniques, this article, for the first time, presents a wideband highly linear receiver (RX) capable of handling blocking scenarios in fifth-generation (5G) microcell base station applications. First, a parallel preselect filter is introduced to satisfy the base station co-location blocking requirements. Next, a combination of third-order RF and baseband (BB) filters is adopted to attenuate close-in blockers by a -120 dB/dec roll-off. Finally, a translational feedback network is proposed to reduce the in-band gain ripple to below 0.5 dB and provide better than -19 dB input matching. Fabricated in the 40-nm CMOS technology, the proposed RX occupies a core area of 0.8 mm2 and consumes 108-176 mW from a 1.3 V supply over the RX's 0.5-3-GHz operating frequency. It achieves a 3-dB bandwidth of 150 MHz and a noise figure (NF) of 2.6-3.9 dB over the RX frequency range. Activating the parallel preselect filter degrades the NF by as little as 1.2 dB in the worst case. The RX shows a ≥q 97.5% throughput when receiving a 100-MS/s quadrature phase shift keying (QPSK) signal with 7.5-dB SNR and achieves a -9.7 dB error vector magnitude (EVM) while facing a -15 dBm continuous-wave (CW) blocker only 20 MHz away from the desired 100-MS/s QPSK signal with 12.3-dB SNR, thus satisfying the 3rd generation partnership project (3GPP) requirements with sufficient margin.

Original languageEnglish
Pages (from-to)2157 - 2172
Number of pages16
JournalIEEE Journal of Solid-State Circuits
Volume58
Issue number8
DOIs
Publication statusPublished - 2023

Keywords

  • Band-pass filters
  • Blocker-tolerant
  • current-mode receiver (RX)
  • fifth-generation (5G)
  • Filtering
  • harmonic rejection (HR)
  • high-order bandpass filter
  • Impedance
  • Linearity
  • Noise measurement
  • Notch filters
  • preselect filter
  • Radio frequency
  • software-defined radio
  • wideband RX

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