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Bandswitched tuning system having a plurality of local oscillators for a digital television receiver

  • US 5,420,646 A
  • Filed: 12/30/1991
  • Issued: 05/30/1995
  • Est. Priority Date: 12/30/1991
  • Status: Expired due to Term
First Claim
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1. A digital television signal tuning system comprising:

  • means for receiving a digital television signal in a given tuning range;

    synthesizer means developing a tuning voltage and including a plurality of variable frequency local oscillators for developing a tuning signal responsive to said tuning voltage;

    bandswitch means in said synthesizer means for subdividing said given tuning range into a plurality of portions corresponding to said plurality of variable frequency local oscillators for improving the noise performance of said synthesizer means; and

    means for supplying a signal, indicative of said digital television signal, to said synthesizer means for controlling said bandswitch means and the operation of said plurality of variable frequency local oscillators for determining said tuning signal, said synthesizer means further including a plurality of buffer amplifiers coupled to said plurality of variable frequency local oscillators, and coupling means connected to the outputs of said buffer amplifiers for supplying said tuning signal.

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