Integrated circuit with improved level shifter
US8723551B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 2009 |
| Grant date | May 13, 2014 |
| Priority date | — |
| Expiry date | Dec 10, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2330/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Level shifting circuitry and corresponding enable signal generating circuitry provides improved leakage current control while eliminating the need for supplying reference voltage input in the enable signal generator. The level shifting circuitry is a type of cascode free level shifting circuit that does not include cascode transistors as in the prior art but instead utilizes cross coupled logic to provide level shifting while also utilizing enable signal controlled transistors to control leakage current through the cross coupled logic during power up sequencing. The level shifting circuitry provides improved leakage current limiting structure for power up sequencing whether a lower level supply voltage ramps up faster than the higher level supply voltage or vice a versa.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.