Integrated circuit device incorporating DLL circuit
US6522182B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1999 |
| Grant date | Feb 18, 2003 |
| Priority date | — |
| Expiry date | Sep 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K5/131
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In the present invention, an external power source supplied to an integrated circuit device is divided into a first external power source for the DLL circuit and a second external power source for circuits other than the DLL circuit. According to the present invention, it is arranged that power source noise generated in the second external power source cannot be transmitted to the variable delay circuit by utilizing the first external power source preferably for the variable delay circuit of the DLL circuit and even more preferably for its delay unit. Also, preferably, it is arranged that power source noise generated in the second external power source cannot be transmitted to the phase coincidence detection unit by utilizing the first power source for the phase coincidence detection unit in the phase comparison circuit of the DLL circuit. Also, by connecting the first external earthing power source to the variable delay circuit and/or phase coincidence detection unit, the effect of power source noise from the second external earthing power source originating from the operation of circuits other than these is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.