The invention provides a near field communication device used for preparing carrier signals for active load modulation supporting synchronous and asynchronous transmission. The NFC device includes: alocal clock generator for generating a reference clock signal (REF_CLK); a clock extractor for recovering a clock signal (EXT_CLK) generated by an NFC initiator device; a frequency tracking module FTMfor executing frequency tracking operation to generate FTM output with the frequency being aligned with the frequency of the input clock signal (REF_CLK or EXT_CLK); and a phase tracking module PTM which performs a phase tracking operation on the FTM output based on EXT_CLK to generate a PTM output with phases being aligned with phases of EXT_CLK. The PTM output acts as the carrier signals at a desired frequency and phase for load-modulating the data of the NFC device to form a load-modulated signal for active transmission to the NFC initiator device.