Low-power sub-harmonic direct-conversion receiver with tunable RF LNA and wideband LO generator at U-NII bands

Jin Siang Syu*, Chin-Chun Meng

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A low-power tunable-band sub-harmonic direct-conversion receiver covering the whole Unlicensed National Information Infrastructure band is demonstrated using 0.18-μm CMOS technology. The RF band is selected by tuning varactors at the loads of the two-stage low-noise amplifier, while a wideband octet-phase generator is applied at the local oscillator (LO) port. The band tuning of both an LC tank and a transformer and the design of an optimal transformer turn ratio are fully discussed in this paper. Vertical-NPN bipolar junction transistors in a standard CMOS process are used at the mixer switching core for excellent 1/f noise performance. As a result, the receiver achieves a 48/50 voltage gain and 4.5/4.8-dB noise figure with a 1/f noise corner of 70 kHz when the RF band is tuned to 5.2/5.8 GHz, respectively. The dc current consumption of the RF front-end (including the LO buffer) is 8.5 mA at a 1.8-V supply.

Original languageEnglish
Article number6135833
Pages (from-to)555-566
Number of pages12
JournalIEEE Transactions on Microwave Theory and Techniques
Volume60
Issue number3 PART 1
DOIs
StatePublished - 1 Mar 2012

Keywords

  • Direct-conversion receiver (DCR)
  • low-noise amplifier (LNA)
  • octet phase
  • phase shifter
  • sub-harmonic mixer (SHM)
  • vertical-NPN (V-NPN)

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