Multi-stage transponder wake-up, method and structure
US5471212A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 26, 1994 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Apr 26, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08G1/017
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system and method which conserves energy in the operation of a transponder or tag (14) by providing that the transponder (14) be enabled or awakened in multiple stages. A threshold detector (62) is provided which measures the power level of received RF energy. If the RF energy received by the detector (62) exceeds a pre-determined level, the transponder (14) then employs a modulation detector (64) to ascertain whether it has been awakened by a valid interrogation signal from an interrogator (12) or whether the RF energy received was merely a spurious burst of RF energy from some other source. If a pre-determined modulation is detected by the modulation detector (64), the transponder (14) is then fully activated to its normal operational state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.