Method and apparatus for generating a phase locked spread...

Pulse or digital communications – Spread spectrum – Frequency hopping

Reexamination Certificate

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C375S135000, C375S376000, C375S373000, C331S057000

Reexamination Certificate

active

10109130

ABSTRACT:
A method of and apparatus for generating a spread spectrum clock signal on an integrated circuit are provided. A target frequency generated by a ring oscillator can be modulated by varying a supply voltage to the ring oscillator, thereby changing the target frequency. In one embodiment, the supply voltage is generated by an analog multiplexer that can be digitally controlled. A fixed voltage source can provide an input signal to the analog multiplexer. In one embodiment, the fixed voltage source can be implemented with a unity gain amplifier.

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