PURPOSE:To obtain a loop filter for a digital PLL circuit with a simple circuit constitution, by adopting a so-called continuous count system which outputs discrimination output only when N-set of consecutive ''1s'' or ''0s'' in discriminating a phase comparison signal. CONSTITUTION:A phase ...
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...
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 ...
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; ...
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. ...
The phase locked loop (PLL) is primary requirement for the synchronous communication system, because the clock synchronization is must for proper data receptions. In such systems the synchronization is performed by PLL. This paper presents a new design for the fast locking digital PLL which reduced...
Digital PLL and digital filter are built based on conventional double closed-loop control which contains voltage loop and current loop. 前者在常规的采用电压外环、电流内环的双闭环控制基础上,搭建数字锁相环、数字滤波器。 www.fabiao.net 2. The X98014's digital PLL generates a pixel clock from the...
A digital Phase-Locked Loop (PLL), comprising a voltage-controlled oscillator (VCO) and a phase meter including a delay line with taps, wherein phase measurements are effected by sending a phase through the delay line and determining the location of this pulse in the delay line at the rate...
Flicker Noise in Observer-Controller Digital PLL The observer-controller loop filter proposed in the author's prior work is extended to include the effect of flicker noise in the digital-controlled oscill... Namgoong,W. - 《IEEE Transactions on Circuits & Systems II Express Briefs》 被引量: ...
A Phase-Locked Loop (PLL) includes a Phase-to-Digital Converter (PDC), a programmable digital loop filter, a Digitally-Controlled Oscillator (DCO), and a loop divider. Within the PDC, phase information is converted into a stream of digital values by a charge pump and an Analog-to-Digital...