Operational amplifier utilizing resistors trimmed by metal migration
US4717886A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Jun 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45188
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
First and second resistors of a resistive network formed in a semiconductive substrate may be individually trimmed. The first and second resistive regions coupled at one end thereof have their other ends provided with metallic contacts. The resistive regions are disposed on the substrate such that current flowing from the first metallic contact to the second metallic contact through the first and second resistive regions causes the resistance of the first resistive region to be preferentially reduced. In contrast, current flowing from the second metallic contact to the first metallic contact through the first and second resistive regions causes the resistance of the second resistive region to be preferentially reduced. The resistive network is used in an operational amplifier circuit so as to permit the input offset voltage to be substantially reduced by selective trimming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.