Patent ID: 8229053

Claim:
A spread-spectrum clock generator comprising: a weight generator configured to generate a plurality of weight currents in response to receipt of respective adjusting signals; a weight generation speed controller configured to generate the adjusting signals and adjust a rate at which each of the adjusting signals is generated in response to a corresponding one of a plurality of control signals, wherein the weight generation speed controller comprises: a plurality of pairs of complimentary series transistors connected in parallel with one another between a first resistor connected to a driving voltage and a second resistor connected to a ground voltage, the gates of each pair receives a corresponding one of the control signals; and a plurality of capacitors, wherein a first terminal of each capacitor is connected to a node between the transistors of a corresponding one of the pairs and a second terminal of each capacitor is connected to the ground voltage, wherein each first terminal outputs a corresponding one of the adjusting signals; a phase mixer mixing a plurality of clock signals with the weight currents, wherein the weight currents differ from each other in phase, and modulating a clock signal resulting from the mixing; and a controller generating the plurality of control signals, wherein a voltage of the adjusting signals increases gradually in an analog manner and the clock signals are generated in an analog manner.