Detection of pulse width tampering of signals
US11022637B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2019 |
| Grant date | Jun 1, 2021 |
| Priority date | — |
| Expiry date | Jul 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/318588
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor system includes a sensor having a charge storage device controllably connected to a voltage source under control of a signal under test; and a readout circuit coupled to the charge storage device to determine whether the pulse width of the signal under test has changed greater than a threshold amount according to a voltage at the charge storage device. In some cases, the determination of whether the pulse width of the signal under test has changed includes determining whether the voltage satisfies a condition with respect to a comparison voltage. In some cases, the determination of whether the pulse width of the signal under test has changed is based on a propagation delay through a delay chain, where the propagation delay is dependent on the voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.