Adjustable current mode differential amplifier for multiple bias point sensing of MRAM having equi-potential isolation
US6674679B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2002 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Oct 1, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2213/77
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An adjustable current mode differential sense amplifier is disposed to be in communication with a selected memory cell and a reference cell having a predetermined value. The amplifier is able to sense current and voltage changes associated with the selected memory cell and compare them to current and voltage changes associated with the reference cell. The operating point of the sensing amplifier may be changed by modifying threshold voltages related to the back gate bias applied to selected transistors in the amplifier. This adjusting capability enables currents or voltages of the sense amplifier to be set when a first bias voltage is applied to a selected memory cell in order to maximize the sensitivity of the amplifier. When a second bias voltage is applied to the memory and reference cells in order to determine the memory cell value, the amplifier is able to sense slight changes in the currents or voltages associated with the selected memory cell and the reference cell and compare them to determine the state of the memory cell. This increased sensitivity enables the amplifier to have a substantially increased dynamic range without introducing components that might adversely affe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.