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公开(公告)号：US11228344B2
公开(公告)日：2022-01-18
申请号：US16702902
申请日：2019-12-04
Inventor： Jernej Rozman , Tilen Svete
IPC: H04B5/00
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.
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