- Patent Title: Regulation and load modulation in a near field communication device
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Application No.: US14685831Application Date: 2015-04-14
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Publication No.: US09661444B2Publication Date: 2017-05-23
- Inventor: Alastair Lefley
- Applicant: Freescale Semiconductor, Inc.
- Applicant Address: US TX Austin
- Assignee: FREESCALE SEMICONDUCTOR, INC.
- Current Assignee: FREESCALE SEMICONDUCTOR, INC.
- Current Assignee Address: US TX Austin
- Priority: GB1006830.2 20100423
- Main IPC: H04B5/00
- IPC: H04B5/00 ; H04W4/00 ; H02J17/00

Abstract:
A near field communications (NFC) device is disclosed that load modulates and regulates a radio frequency (RF) signal. The NFC device includes a rectifier that rectifies the RF signal to provide a direct current voltage. The NFC device also includes a modulator that modulates a data signal. The modulator provides a first voltage when the data signal is at a first level and provides a second voltage when the data signal is at a second level. The NFC device utilizes a regulator to regulate and to load modulate the RF signal. The regulator adjusts an impedance based upon a comparison of the DC voltage provided by the regulator to the first voltage provided by the modulator for the data signal at the first level or to the second voltage provided by the modulator for the data signal at the second level.
Public/Granted literature
- US20150223014A1 Regulation and Load Modulation in a Near Field Communication Device Public/Granted day:2015-08-06
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