Semiconductor integrated circuit
US4935800A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | Feb 21, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10D89/00
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
This invention discloses a semiconductor integrated circuit in which an analog circuit and a digital circuit are formed on a single chip. The semiconductor integrated circuit includes a p-type semiconductor region, an n.sup.+ -type buried region formed on the p-type semiconductor region, an n-type semiconductor region formed on the n.sup.+ -type buried region, a first isolation portion, extending through the n-type semiconductor region and the n.sup.+ -type buried region and reaching the p-type semiconductor region, for isolating adjacent transistors in an analog circuit formed on the n-type semiconductor region, and a second isolation portion, formed in the n-type semiconductor region, for isolating adjacent transistors in the n-type semiconductor region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.