Method and apparatus for generating a phase locked spread spectrum clock signal
US7254157B1 · kind B1 · utility
67Cited by
15References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2002 |
| Grant date | Aug 7, 2007 |
| Priority date | — |
| Expiry date | Apr 8, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/84
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.