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Transmitter and receiver for use in a wireless cursor control system

  • US 6,441,804 B1
  • Filed: 02/01/1999
  • Issued: 08/27/2002
  • Est. Priority Date: 02/23/1998
  • Status: Expired due to Fees
First Claim
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1. A cursor control device comprising:

  • an encoder for generating position information regarding the cursor pointing device;

    a button circuit for receiving user activated button signals;

    a controller coupled to the encoder and the button circuit for receiving the position information and button signals, respectively, and responsive thereto for generating a control signal; and

    a high frequency modulator coupled to the controller for receiving the control signal and generating an output signal to be transmitted to a receiver, said high frequency modulator including;

    a variable frequency modulator circuit having a switching transistor that is selectively turned on or off to select between one of only two predetermined frequency deviations of the control signal; and

    a high frequency circuit for increasing the frequency deviation of the control signal;

    wherein the variable frequency modulator circuit further includes a first capacitor and a second capacitor that are in parallel when the switching transistor is turned on.

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