Patent ID: 7304522
Filing Date: 2007-12-04
Classification: G06F,H03K,H04B

Abstract:
1. A spread spectrum clock generator comprising: a plurality of delay cells, wherein each delay cell includes at least one delayer receiving an external regular clock signal and causing a predetermined propagation delay to the received regular clock signal to generate a delayed clock signal, and a controller transmitting a control signal to the delayer to control the propagation delay of the delayer according to a state value of the control signal; wherein: the delay cells comprise, a first delay cell having a first delayer and a first controller controlling the first delayer to generate the delayed clock signal, and a last delay cell having a last delayer and a last controller controlling the last delayer to generate a last delayed clock signal in response to the delayed clock signal, and the generator further comprises: a controller initializer transmitting a driving signal to the last controller of the last delay cell to generate the control signal.