The DPLL is a digital loop filter/controller designed to be used in conjunction with Silicon Creations Fractional-N PLLs. The resulting dual-loop PLL can attenuate jitter in extremely noisy reference clocks (and "gapped clocks" such as in OTN SerDes repe
A digital loop filter installed in an all-digital phase-locked loop (PLL) receives a digitally controlled oscillator (DCO) control code transmitted from a PLL controller in the all-digital PLL, and calculate an average value, such that the PLL controller can produce another DCO control code by...
中间图显示了PLL时钟恢复结果,橙色迹线是从接收到的数据中检测到的边缘信号,黄色迹线是NCO的输出,数字振荡器可以产生与发射端时钟完全相同的信号,仅使用发射数据的翻转边沿作为参考,看不到原始的Tx时钟。 Transient response of the PLL loop. 可以看到一开始,PI loopfilter输入端的相位误差很高,因为NCO开始运行的相位...
PLL主要模块: Phase Detector 类似EA, 放大 data in和dclock的 time difference. 送到 Loop filter. 经过Voltage-controlled oscillator (VCO). 这里有环路稳定性考量. DPLL不稳定的标准是the edge of output is not synchronized with the data, 即 not locked. ...
网络释义 1. 数字锁相环 按照实现技术,可以分为模拟锁相环(Analog PLL)和数字锁相环(Digital PLL)。按照反馈回路,可以分为整数倍分频锁相环(Integ… baike.c114.net|基于30个网页 2. 数位锁相环 按照实现技术,可以分为类比锁相环(Analog PLL)和数位锁相环(Digital PLL)。按照反馈回路,可以分为整数倍分频锁...
用于数字PLL的环路滤波器中的位宽减小. For digital PLL loop filter to reduce the bit width. 公开的发明涉及具有被配置成选择性地操作于不同级别的分辨率的可切换数字环路滤波器的数字锁相环. The invention disclosed relates to a configured to selectively operate at different levels of resolution of the ...
There are several key points required for high performance D-PLL circuits design such as power efficiency, loop bandwidth flexibility and accurate frequency translation. This paper describes a novel D-PLL architecture and presents an analysis of the digital loop filter. 关键词: audio systems ...
In Part 1, we found the time response of a 2nd order PLL with a proportional + integral (lead-lag) loop filter. Now let’s look at this PLL in the Z-domain [1, 2]. We will find that the response is characterized by a loop natural frequency ωn and damping coefficient ζ. ...
A digital loop filter includes a first loop filter for generating first phase control information at variable time intervals on the basis of phase error information indicating a phase difference betwe
Digital PLL-based frequency synthesis: effect of loop filter shape on required DCO frequency resolution.doi:10.1049/el.2014.1804In digital phase-locked loops (PLLs), the finite resolution of digital representation (quantisation) could pose problems, including jitter peaking and limit-cycle behaviour; ...