Method of contactless communication between object and reader using active load modulation

The invention relates to a contactless communication method between an object and a reader using active load modulation. In one embodiment, an object may contactlessly communicate with a reader using active load modulation. The method includes detecting a sensed magnetic field emitted by the reader, initializing a phase-locked loop of the object, detecting a stop of the sensed magnetic field emitted by the reader before initialization of the phase-locked loop of the object is completed, calibrating an oscillator of the phase-locked loop based on an internal clock of the object, detecting a new sensed magnetic field of the reader after calibrating the oscillator, and transmitting the new sensed magnetic field to the reader. And implementing a phase-locked loop to adjust the phase of the oscillator after detecting a new sensed magnetic field. 本公开涉及使用有源负载调制的对象和读取器之间的无接触通信方法。在一个实施例中，对象可以使用有源负载调制与读取器无接触地通信。该方法包括检测由读取器发射的感测磁场，初始化对象的锁相环，在初始化对象的锁相环完成之前检测由读取器发射的感测磁场的停止，基于对象的内部时钟校准锁相环的振荡器，在校准振荡器之后检测读取器的新感测磁场，以及实施锁相环以在检