A 1.2 nJ/bit 2.4 GHz receiver with a sliding-IF phase-to-digital converter for wireless personal/body area networks

Yao Hong Liu, Ao Ba, J.H.C. van den Heuvel, Kathleen Philips, Guido Dolmans, Harmke de Groot

Research output: Contribution to journalArticleAcademicpeer-review

29 Citations (Scopus)

Abstract

This paper presents an ultra-low power 2.4 GHz FSK/PSK RX for wireless personal/body area networks. A single-channel phase-tracking RX based on a sliding-IF phase-to-digital conversion (SIF-PDC) loop is proposed to directly demodulate and digitize the frequency/phase-modulated information. The sliding-IF frequency plan reduces the power consumption of the multi-phase LO generation. A phase rotator is adopted in SIF-PDC to guarantee frequency stability, i.e., avoid the frequency pulling by interference or frequency drift. It equivalently transforms the RF signal processing from the I/Q amplitude domain to a digital-phase domain, which saves up to nearly 40% on power consumption and relaxes the digital baseband complexity. A phase-domain linear model of the proposed SIF-PDC is presented to analyze the frequency response. Fabricated in a 90 nm CMOS technology, the presented RX consumes 2.4 mW at 2 Mbps data rate, i.e., 1.2 nJ/b efficiency, and achieves a sensitivity of -92 dBm.

Original languageEnglish
Article number6955862
Pages (from-to)3005-3017
Number of pages13
JournalIEEE Journal of Solid-State Circuits
Volume49
Issue number12
DOIs
Publication statusPublished - 1 Dec 2014

Keywords

  • Bluetooth low energy receiver
  • Delta-Sigma frequency-to-digital converter
  • Delta-Sigma phase-to-digital converter
  • frequency demodulator
  • frequency digitizer
  • phase demodulator
  • phase digitizer
  • PLL demodulator
  • ultra-low power receiver
  • ZigBee receivers

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