A HIGH ORDER ALL DIGITAL PHASE LOCKED LOOP WITH TANDEM STRUCTURE
一种级联结构的高阶全数字锁相环

A high order all digital phase locked loop with tandem structure is presented. A 2-order all digital PLL is implemented and its performance is verified by simulation. An example is given for SDH 2048Kb/s tributary recovery. Its performances are simulated and compared with the theoretical analysis.