QUICK SYNCHRONIZATION BETWEEN AN OBJECT AND A CONTACTLESS COMMUNICATING READER THROUGH ACTIVE CHARGE MODULATION

摘要

Object (TG) capable of communicating contactlessly with a reader (RD) by active load modulation, configured to receive a first carrier signal (clex) transmitted by the reader (RD) and deliver a second carrier signal (OUT) , the object comprising synchronization means (MSYNC) configured to synchronize a first carrier signal (clex) and the second carrier signal (OUT), said synchronization means (MSYNC) comprising detection means (MD) configured to detecting the locking of said loop (DPLL), and control means (MC) configured to control the frequency of the output signal of an oscillator (DCO) by controlling the oscillator (DCO) with a first control signal (VAL1 ) generated from a first value (ERR1) representative of the phase error of said phase locked loop (DPLL), then with a second control signal (VAL2) generated from a second value (ERR2) ) delivered by a first module (MD1) configured to perform a modulo type operation on said first value (ERR1) representative of the phase error of the loop.