Compensated capacitors for switched capacitor input of an analog-to-digital converter
US4918454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1988 |
| Grant date | Apr 17, 1990 |
| Priority date | — |
| Expiry date | Oct 13, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/496
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A semiconductor capacitor for use in an analog-to-digital converter includes two parallel connected capacitors with separate lower plates (44) and (46) fabricated of polycrystalline silicon and upper plates (52) and (54) also fabricated of polysilicon. The plates are separated by capacitive oxide dielectric structures (48) and (50). They are interconnected such that the lower plate (44) of one capacitor is connected to the upper plate (54) of the other capacitor and the lower plate (46) of the other capacitor is connected to the upper plate (52) of the first capacitor. With such a configuration, the odd ordered non-linearities contributing to the voltage coefficient errors are cancelled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.