Patent ID: 6167103
Filing Date: 2000-12-26
Classification: G06F,H03L,H04B

Abstract:
A clock controlled electronic device having a clock to provide spread spectrum clock signals to said device, said spread spectrum clock comprisinga programmable memory to store a table of digital values,a first counter to address said table at different parts of said table determined by different counts of said first countera switching circuit to transfer the contents of said memory when in a running state, and to transfer initiation data when in an initiation state,a second counter to receive said stored digital values addressed by said different counts of said first counter when said switching circuit is in said running state, said second counter being responsive to clock signals to step said second counter after said second counter receives each said digital value,a phase detector responsive to the difference in phase of two inputs to produce an output representative of the phase difference of said two inputs of said phase detector, said second counter providing an output signal upon reaching a predetermined value, said output signal providing a control signal to step the count of said first counter and said output signal providing one input to said phase detector,a source of reference signals providing the second input of said phase detector,a voltage controlled oscillator having an input receiving said output of said phase detector to form a voltage controlled oscillator, the output of said phase locked loop providing said spread spectrum clock signals to said device.