Multi-beam spatio-spectral beamforming receiver for wideband phased arrays

Sachin Kalia, Satwik A. Patnaik, Bodhisatwa Sadhu, Martin Sturm, Mohammad Elbadry, Ramesh Harjani

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


This paper reports the first analog integrated spatio-spectral beamforming front-end. The proposed front-end allows for accurate beam steering of signals with large fractional bandwidths, thus minimizing beam squinting, and simultaneous and independent steering of multi-carrier signals. Different spatio-spectral beamforming strategies are discussed and compared. As a proof of concept, an 8 GHz 2-channel, 4-frequency phased-array beamformer is designed and implemented in 65 nm CMOS. The IF signal on each channel is frequency split using an all passive 4-point analog FFT. The orthogonal frequency outputs are then beam-steered using an all passive I-Q vector-combiner. The RF circuit draws 22.8 mA from a 1.2 V supply while the analog baseband consumes 135 μ W at 120 MS/s (9 pJ/conv.).

Original languageEnglish (US)
Article number6519323
Pages (from-to)2018-2029
Number of pages12
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number8
StatePublished - May 30 2013


  • Analog FFT
  • beam squinting
  • blocker
  • broadband
  • fractional bandwidth
  • frequency channelization
  • phased-arrays
  • space-only
  • spatio-spectral
  • switched-capacitor
  • vector-combiner
  • wideband

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