Project: Low Cost VHF Synthesizer



Design Services Performed:


This synthesizer was designed to drive a low cost VHF Aircraft Band receiver, but it has applications to any VHF radio in the 75 to 180 MHz band. Low phase noise and reference feed through were also design goals. The design was implemented in just a few day's and was fully tested and characterized. Code was written to allow the synthesizer to be turned on and programmed, thus eliminating extra firmware support from the client.

  • Very low cost Local Oscillator (LO) implementation.
  • 3 wire PLL interface.
  • Single supply operation.
  • Reference spur suppression > 80 dBc.
  • Tuning steps of 5, 6.25, 8.33, 10, 12.5 or 25 kHz
  • 20 MHz tuning range anywhere in the 75 to 180 MHz band.
  • Phase noise of 115 dBc / Hz at 10 kHz offset.
  • 0 dBm output power.
  • Self contained low noise, low drift, crystal reference oscillator.
  • RF and PSpice simulations used to verify and optimize the VCO design.

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