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Method and apparatus for tuning and aligning an FM receiver

  • US 5,428,829 A
  • Filed: 09/28/1992
  • Issued: 06/27/1995
  • Est. Priority Date: 09/28/1992
  • Status: Expired due to Term
First Claim
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1. A method for tuning an FM receiver front end including at least one tank resonant circuit and one VCO, comprising the steps of:

  • receiving a control signal indicative of a desired FM channel frequency;

    developing a VCO tuning voltage signal responsive to the control signal;

    applying the VCO tuning voltage signal to a series circuit including a diode to develop a voltage drop across the diode;

    developing at least one gain command responsive to (i) the control signal and (ii) at least one predetermined variable; and

    developing a tank tuning voltage for the tank resonant circuit responsive to (i) the VCO tuning voltage signal, (ii) the gain command, and (iii) the voltage drop across the diode, wherein the tank tuning voltage equals the VCO tuning voltage plus the voltage drop across the diode multiplied by the gain command reduced by the voltage drop across the diode to provide the tank tuning voltage with a temperature coefficient substantially equal to that of the VCO tuning voltage.

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