Circuit and method of reducing cross-talk in an integrated circuit substrate
US5900763A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/00
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
An integrated circuit (10) provides analog and digital circuitry on a common substrate (12). A first digital circuit (14) operates in combination with an analog circuit (18) to perform a useful function. A second duplicate digital circuit (26) is disposed adjacent to the first digital circuit and operates out-of-phase with respect to the first digital circuit. The second duplicate digital circuit introduces voltage spikes equal and opposite to the voltage spikes introduced into the substrate by the first digital circuit. The equal and opposite voltage spikes tend to cancel and thereby minimize cross-talk between the digital and analog circuits. A guard ring (16,28) surrounds each of the first and second digital circuits and the analog circuit to reduce voltage spikes into the substrates. By minimizing cross-talk, the analog circuit operates without interference from the digital circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.