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Wake up device for communications system

  • US 20070142020A1
  • Filed: 11/09/2006
  • Published: 06/21/2007
  • Est. Priority Date: 07/15/1993
  • Status: Active Grant
First Claim
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1. A radio communications system comprising:

  • a master receiver circuit having a sleep mode and an active mode, the master receiver circuit being configured to consume less power in the sleep mode than in the active mode;

    a switch circuit configured to control when the master receiver circuit switches between the sleep mode and the active mode;

    a receiver input configured to receive radio signals; and

    a wake-up detector circuit, coupled to the receiver input, including;

    circuitry configured to reject any of said radio signals not having a data rate equal to a predetermined first data rate, and to generate a wake-up mode signal when the receiver input receives a radio signal having a data rate equal to said first data rate;

    wherein the switch circuit switches the master receiver from the sleep mode to the active mode in response to the data rate detector circuit generating said wake-up mode signal; and

    wherein the switch circuit does not switch the master receiver from the sleep mode to the active mode in response to the receiver input receiving a radio signal having a data rate not equal to said first data rate.

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