Low voltage fully differential operational amplifier with improved common mode circuitry
US5844442A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 21, 1997 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45478
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A fully differential operational amplifier with improved common mode circuitry for low supply voltage applications is disclosed. The amplifier includes inventing and non-inventing inputs and dual-ended invented and non-invented outputs. The amplifier also includes source transistors for pulling the output to obtain particular output voltage swing. Connections between the inputs and outputs include DC biasing circuitry. The amplifier includes a transistor of select size and characteristics to compensate for voltage drop due to other transistors of the amplifier. Common mode circuitry of the amplifier provides a high level of common mode reconstruction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.