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Clock spreading systems and methods

  • US 7,944,319 B2
  • Filed: 03/31/2009
  • Issued: 05/17/2011
  • Est. Priority Date: 03/31/2009
  • Status: Active Grant
First Claim
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1. An integrated transceiver system comprising:

  • a base band control system;

    a transceiver coupled to the base band control system; and

    a clock spreading system that provides a spread clock output signal derived from a clock reference signal for clocking one of the base band control system and the transceiver, the clock spreading system being configured to provide a periodic phase modulated spread clock output signal during receiving of data in a receive mode and a pseudo-random phase modulated spread clock output signal during transmitting of data in a transmit mode;

    wherein the clock spreading system employs a triangular modulation for the modulation of both the periodic phase modulated spread clock output signal and the pseudo-random phase modulated spread clock output signal;

    wherein the clock spreading system employs the triangular modulation by sequentially selecting between a plurality of phase delay offset clock signals sequentially spaced apart in predetermined phase delay offset increments in increasing increments from a zero phase delay offset to a maximum phase delay offset and sequentially selecting between the plurality of phase delay offset clock signals in decreasing increments from the maximum phase delay offset to the zero phase delay offset.

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