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System and method for coarse/fine PLL adjustment

  • US 6,591,091 B1
  • Filed: 11/12/1999
  • Issued: 07/08/2003
  • Est. Priority Date: 11/12/1998
  • Status: Expired due to Fees
First Claim
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1. A method of tuning a receiver that maintains a signal output from the receiver during the tuning process comprising:

  • selecting a channel to be tuned;

    tuning the channel to approximately a desired first intermediate frequency by a first frequency source that is adjustable in coarse steps and having a wide bandwidth;

    filtering the channel at the desired first intermediate frequency in a bandpass filter having passband that is sufficiently wide to pass the channel and a portion of another channel; and

    tuning the channel at the first intermediate frequency to a second intermediate frequency by a second frequency source that is adjustable in fine steps and having a narrow bandwidth relative to the wide bandwidth of the first frequency source;

    wherein the tuning steps are performed in accordance with the following equation;

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