湖南大学学报（自然科学版）2017，Vol.44Issue(8)：131-136,6.DOI:10.16339/j.cnki.hdxbzkb.2017.08.020
一种结合高精度TDC的快速全数字锁相环
A Fast All Digital Phase-locked Loop with High Precision TDC
摘要
Abstract
As the traditional all digital phase-locked loop has the shortcomings such as a long period of lock phase and a large quantization error of TDC,this paper proposes a fast digital phase-locked loop based on high resolution TDC.The new design characterizes that the phase adjustment circuit makes the quantized phase difference restore to time series,which can comprehensively consider the reconstruction signal under the control of the state machine.In this case,the phase can be aligned for the maximum of two reference clock periods,and the phase lock time is controlled within 0.72 μs when the phase difference is detected.Meanwhile,when the reconstructed signal and the reference one are at the same frequency,the rising edge detection circuit can accurately detect whether the rising edges of signals are arriving simultaneously or not,and can generate the suitable enable signal to turn off the TDC circuit reducing the power consumption.Moreover,the design optimizes the coarse quantization method of TDC with multi-clocks and multi-phase and increases the measuring range.Additionally,the quantization error is controlled within 0.25 ns.Finally,the whole design is modeled in the RTL level and simulated,which shows that the new all digital phase-locked loop has the high speed of locking phase,high precision,high stability,low power consumption,and convenience to adjust the output frequency.关键词
全数字锁相环/时间数字转换器/相调电路/可编程逻辑门阵列Key words
all digital phase-locked loop/time-to-digital converter/phase adjustment circuit/field-programmable gate array分类
信息技术与安全科学引用本文复制引用
姚亚峰,孙金傲,霍兴华,刘建..一种结合高精度TDC的快速全数字锁相环[J].湖南大学学报（自然科学版）,2017,44(8):131-136,6.基金项目
国家自然科学基金资助项目(41304078),National Natural Science Foundation of China(41304078) （41304078）
