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1. (WO2018100369) NEAR FIELD COMMUNICATION DEVICE WITH VOLTAGE REGULATION COMPRISING AN INTEGRAL CONTROLLER AND A VARIABLE SHUNT RESISTANCE

Pub. No.:    WO/2018/100369    International Application No.:    PCT/GB2017/053602
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Nov 30 00:59:59 CET 2017
IPC: H04B 5/00
G05F 1/46
G05F 1/56
G05F 1/613
Applicants: NORDIC SEMICONDUCTOR ASA
SAMUELS, Adrian James
Inventors: BALASUBRAMANIAN, Shankkar
Title: NEAR FIELD COMMUNICATION DEVICE WITH VOLTAGE REGULATION COMPRISING AN INTEGRAL CONTROLLER AND A VARIABLE SHUNT RESISTANCE
Abstract:
An electronic device (24) is arranged to receive near-field communication signals and comprises: first and second antenna connection terminals (26, 28) and a variable shunt resistance (34) connected between the first and second antenna connection terminals. The device further comprises a peak detector (36) arranged to detect an amplitude of an incoming near-field communication signal across the antenna connection terminals and to produce a peak signal (Vpd) dependent on the amplitude and a comparator (40) arranged to produce an error signal, wherein the error signal is dependent on a difference between the peak signal and a reference signal (Vrefpeak). The device also comprises an integral controller (42) which is arranged to vary the shunt resistance in response to an integral of the error signal. Said configuration is employed for regulating the received voltage and reducing voltage swing.