On-Chip Stimulus Generation for Test and Calibration of NFC Reader Receivers
US-2015249510-A1 · Sep 3, 2015 · US
Near field communication enabled device with improved electromagnetic compatibility and a method of load modulating in near field communication
US9306630B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9306630-B2 |
| Application number | US-201414324512-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 7, 2014 |
| Priority date | Jul 8, 2013 |
| Publication date | Apr 5, 2016 |
| Grant date | Apr 5, 2016 |
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Abstract
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A near field communication (NFC) initiator communicates with a target device. The carrier is modulated to transmit a digital signal. During time slots allocated for target communication, the field is load modulated by the target. The target load modulator is driven by a digital modulator to vary voltage at antenna terminals so that peak amplitude of the carrier varies for specified periods between high and low values. To alleviate interference in the target device caused by the generation of aliases during transition, the load modulator sequentially applies a range of resistances to vary the amplitude (voltage) during transition according to a specific waveform determined by the infinite impulse response of a low pass filter tuned to the cut of frequency and sampling frequency determined according to the coexistence and cohabitation specifications of a chip in which the NFC functionality is embedded.
First claim
Opening claim text (preview).
What is claimed is: 1. An NFC enabled device capable of operating in a target mode, comprising: a device antenna circuit; a load modulator connected to the device antenna circuit and configured to load modulate a radio frequency magnetic field by altering the voltage amplitude of a carrier wave applied at terminals of the device antenna circuit, wherein the modulation transitions between high and low values to transmit a digital signal, wherein the load modulator alters the vo…
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Classifications
- H04B5/24Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
- H04B5/0031Primary
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9306630B2 cover?
- A near field communication (NFC) initiator communicates with a target device. The carrier is modulated to transmit a digital signal. During time slots allocated for target communication, the field is load modulated by the target. The target load modulator is driven by a digital modulator to vary voltage at antenna terminals so that peak amplitude of the carrier varies for specified periods betw…
- Who is the assignee on this patent?
- St Microelectronics Int Nv
- What technology area does this patent fall under?
- Primary CPC classification H04B5/24. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Apr 05 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).