High swing low power general purpose operational amplifier
US5805021A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Feb 13, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/265
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An operational amplifier circuit is provided which includes: 1) a first folded-cascode gain stage having a differential pair of natural V.sub.T devices which are P-channel transistors; 2) a second gain stage connected to an output of the first folded-cascode gain stage; 3) a slave source follower stage connected to an output of the second gain stage; 4) a second folded-cascode stage connected to an output of the slave source follower stage; and 5) a source follower output stage connected to an output of the second folded-cascode gain stage. The high swing output stage of the operational amplifier, which includes stages 3-5 above, includes a pair of natural V.sub.T devices which are P-channel transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.