Patent · US Active

Low power mode card detection

US11228344B2 · kind B2 · utility

0Cited by

0References

21Claims

0Family size

Assignee

STMicroelectronics Razvoj Polprevodnikov D.O.O. · SI

Inventors

Jernej Rozman · Ravne na Koroškem, SI
Tilen Svete · Lilltjärnen, SI

Key dates

Filing date	Dec 4, 2019
Grant date	Jan 18, 2022
Priority date	—
Expiry date	Feb 9, 2040

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02D30/70
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A circuit includes an in-phase/quadrature down converter configured to be coupled to an antenna of a first NFC (near field communication) device. DC cancellation circuitry is coupled at outputs of the converter. Detection circuitry is configured to analyze DC signals output by the DC cancellation circuits to detect the presence of a second NFC device.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.