Invention Grant
- Patent Title: NFC device with PLL controlled active load modulation
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Application No.: US14577303Application Date: 2014-12-19
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Publication No.: US09281874B2Publication Date: 2016-03-08
- Inventor: Alastair Lefley
- Applicant: Broadcom Corporation
- Applicant Address: US CA Irvine
- Assignee: Broadcom Corporation
- Current Assignee: Broadcom Corporation
- Current Assignee Address: US CA Irvine
- Agency: Sterne, Kessler, Goldstein & Fox P.L.L.C.
- Main IPC: H04B7/00
- IPC: H04B7/00 ; H04B5/00 ; G06K7/10 ; G06K19/07

Abstract:
A wireless communication device for communicating in the near-field via active load modulation. The device including an antenna configured to receive a magnetic field, a recovery device configured to recover a clock from the magnetic field, and a multiplexer configured to receive the recovered clock and a reference clock, and to output one of the recovered clock and the reference clock based on a current operational state of the wireless communication device, The wireless communication device further including a shunt regulator configured to produce the active load modulation by modulating an impedance of the wireless communication device, a phase-locked loop (PLL) configured to receive one of the recovered clock and the reference clock and to utilize the received clock to control the active load modulation, and a driver configured to contribute to the active load modulation by adjusting an amplitude of a voltage across the antenna.
Public/Granted literature
- US20150105016A1 NFC Device With PLL Controlled Active Load Modulation Public/Granted day:2015-04-16
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