Patent ID: 7561652

Claim:
An electronic data processing device, comprising: a reference clock; a phase detector for receiving an input from said reference clock; a filter for receiving an input from said phase detector; a first adder for receiving an input from said filter; an oscillator for receiving an input from said first adder; a phase locked loop modulator for receiving an input from said oscillator, said modulator having: a pre-divider; a down counter for counting down from a predetermined constant value; said pre-divider receiving a digital input signal from said oscillator and providing an output to a clock input of said down counter producing an output which is connected as an additional input to said phase detector; a memory; a second adder; a first divider; a first up or down counter; said first divider receiving said output from said down counter and providing an output to an input of said first up or down counter having an output supplied to an input of said memory for providing a slow rate of modulation signal as an input to said second adder; a second divider; a second up or down counter; said second divider receiving said output from said down counter and providing an output to an input of said second up or down counter having an output supplied to said input of said memory for providing a fast rate of modulation signal as another input to said second adder; a digital to analog converter; and said second adder producing an output supplied to said digital to analog converter, said digital to analog converter producing an analog modulation signal output supplied as another input to said first adder; and an operative clock to provide spread spectrum clock control output from said oscillator to a clocked device, said spread spectrum clock control output having an operative profile that has a deviation of frequency of at least plus or minus 2.5 MHz and a modulation frequency of at least 150 kHz, wherein said spread spectrum clock control output being derived from said reference clock having a frequency of less than a central frequency defining the deviation of frequency.