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Frequency tuning and phase shifting techniques using 1-dimensional coupled voltage-controlled-oscillator arrays for active antennas

  • US 8,558,625 B1
  • Filed: 11/10/2010
  • Issued: 10/15/2013
  • Est. Priority Date: 11/13/2009
  • Status: Active Grant
First Claim
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1. An RF VCO array for active antennas, the VCO array comprising:

  • multiple non-linear VCO unit cells arranged in one dimension on a monolithic chip, each VCO unit cell includinga generator circuit for generating a negative resistance VCO oscillation frequency range; and

    a tuner circuit for tuning the VCO oscillation frequency range;

    the VCO unit cells DC-coupled to one another, in a nearest neighbor configuration, through an impedance-coupling network of coupling elements each having a variable VCO coupling strength, to allow the VCO array to be frequency and phase tuned by varying the VCO coupling strength independently between VCO unit cells; and

    a passive edge termination circuit coupled to the respective edges of the VCO unit cell arrangement for controlling the tuning range of VCO operating frequencies.

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