Digital downconverter, digital match filter, difference demodulation and AFC is discribed in detail, parameter of the programmable registers are also discussed.

• 本文对数字下变频器、数字匹配滤波器、差分解调、自动频率控制环路等进行详细的阐述及算法推导，同时对芯片内关键的可编程寄存器参数的选择进行讨论。