排序方式: 共有46条查询结果,搜索用时 78 毫秒
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本文利用0.13um CMOS工艺实现了一个工作频率为4224兆赫兹的锁相环。 通过采用动态鉴频鉴相器缩短延时复位脉冲来最小化电荷泵引入的噪声。文中分析了电荷泵的动态失配问题。通过平衡开关信号的负载,电荷泵实现了好的动态匹配特性。本文还设计了输入端负载平衡的高速的分频器来提高锁相环的带内噪声性能。该4224MHz锁相环在10 kHz以及 1 MHz频偏处的相位噪声分别为 -94 dBc/Hz 和 -114.4 dBc/Hz。时钟抖动的均方根值为0.57ps(从100Hz到100MHz范围积分)并且使用二阶低通滤波器的参考频率杂散为 -63 dB。 相似文献
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A novel clock distribution concept based on inband phase-modulated pilot insertion is demonstrated.This method avoids the need for an ultrafast phase comparator and a phase-locked loop in the receiver.Experimental results show that the clock can be successfully extracted from 160Gbit/s optical time-division multiplexing (OTDM) data signal and employed for demultiplexing of 40Gbit/s tributaries.The in-band clock distribution introduces 1.5dB of power penalty with an error-free performance. 相似文献
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A 4224 MHz phase-locked loop (PLL) is implemented in 0.13 μm CMOS technology. A dynamic phase frequency detector is employed to shorten the delay reset time so as to minimize the noise introduced by the charge pump. Dynamic mismatch of charge pump is considered. By balancing the switch signals of the charge pump, a good dynamic matching characteristic is achieved. A high-speed digital frequency divider with balanced input load is also designed to improve in-band phase noise performance. The 4224 MHz PLL achieves phase noises of-94 dBc/Hz and -114.4 dBc/Hz at frequency offsets of 10 kHz and 1 MHz, respectively. The integrated RMS jitter of the PLL is 0.57 ps (100 Hz to 100 MHz) and the PLL has a reference spur of-63 dB with the second order passive low pass filter. 相似文献
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随着粗波分复用(CWDM)在城域网中的应用日益增多,对CWDM设备的网络管理也更显重要。文章对城域CWDM系统的网络管理子系统的组网,及多个CWDM系统集中网管的组织实现等方面进行了分析讨论,并提出了建议。 相似文献
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根据正交分解原理和离散傅里叶变换的物理意义,提出了一种分析滤波器组具有理想特性的信号分解与重构新方法(Discrete Fourier transform subband decomposition,DFTSD).对于给定序列,通过离散傅里叶变换,将其变换到频域,通过谱线分组,在频域实现信号的分解,经反变换得到时域子带信号.频谱上无交叠的子带信号,从根本上解决了抽取过程所带来的带内混叠问题.综合滤波器组的设计仅需考虑内插后引入的镜像频率分量的滤除.实验结果表明,在无子带抽取和存在子带抽取情况下,重构信号与原信号的平均绝对误差在10~(-16)量级. 相似文献
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Hybrid crosstalk aware Q-Factor analysis for selection of optical virtual private network connection
The presence of physical layer impairments (PLIs) in high-speed optical virtual private network (OVPN) over wavelength-division multiplexing/ dense-wavelength division multiplexing network degrades the connection quality (CQ). The quality can be numerically expressed as the quality factor (Q-Factor) of the connection. The CQ can be further affected by the increasing demand of connections and data speed. It is important to have an efficient OVPN control manager (OVPNCM) to maintain the CQ. OVPNCM can ensure better quality of transmission to the OVPN clients. Traditional routing and wavelength assignment (RWA) algorithms have less regards to the PLIs and cannot provide guaranteed OVPN connection (OVPNC) quality. In order to achieve a guaranteed CQ, we proposed a wavelength assignment (WA) scheme and a hybrid crosstalk model based on linear in-band and nonlinear four-wave mixing crosstalk. The performance of the proposed WA scheme with the hybrid crosstalk model is demonstrated. The results show that the proposed hybrid crosstalk model with WA scheme not only provides a guaranteed OVPNC, but also improves the OVPN performance in terms of blocking probability. 相似文献
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