Pulse or digital communications – Spread spectrum – Frequency hopping
Reexamination Certificate
2007-08-07
2007-08-07
Phu, Phuong (Department: 2611)
Pulse or digital communications
Spread spectrum
Frequency hopping
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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Crotty Patrick J.
Lesea Austin H.
Cartier Lois D.
Harms Jeanette S.
Maunu Leroy D.
Phu Phuong
Xilinx , Inc.
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