Offset-canceling (OC) write operation sensing circuits for sensing switching in a magneto-resistive random access memory (MRAM) bit cell in an MRAM for a write operation
US10290340B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C11/1693
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Aspects disclosed in the detailed description include offset-canceling (OC) write operation sensing circuits for sensing switching in a magneto-resistive random access memory (MRAM) bit cell in an MRAM for a write operation. The OC write operation sensing circuit is configured to sense when MTJ switching occurs in MRAM bit cell. In an example, the OC write operation sensing circuit includes a voltage sensing circuit and a sense amplifier. The voltage sensing circuit employs a capacitive-coupling effect so that the output voltage drops in response to MTJ switching for both logic ‘0’ and logic ‘1’ write operations. The sense amplifier has a single input and a single output node with an output voltage indicating when MTJ switching has occurred in the MRAM bit cell. A single input transistor and pull-up transistor are provided in the sense amplifier in one example to provide an offset-canceling effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.