Positive feedback latch amplitude limiting control circuit and method of passive radio frequency identification tag
US11893438B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 2021 |
| Grant date | Feb 6, 2024 |
| Priority date | — |
| Expiry date | Oct 12, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/07773
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A positive feedback latch amplitude limiting control circuit and method of the passive radio frequency identification tag of the present disclosure dynamically control the voltage between the first and the second antenna terminal. When the voltage between the antenna terminals is too high, the signal generating circuit turns on the discharge circuit, which reduces the rectified DC voltage. When the voltage between the antenna terminals is within the limited voltage, the signal generating circuit turns off the discharge circuit. The discharge circuit in the present disclosure includes a MOS transistor whose gate voltage is indirectly controlled by a latch. A positive feedback mechanism of the latch makes the first control signal S1 have a substantially strong strength when being pulled to a low level, such that the discharge path is fully turned off, which avoids a discharge of the MOS transistor being in a sub-threshold region, thereby improving communication performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.