在电子电路中,特别是涉及信号处理和通信的电路中,振荡器的稳定性和精度至关重要。影响振荡器性能的两个关键因素是抖动和相位噪声。 什么是抖动? 抖动是指信号周期事件的时间偏差。它本质上是信号周期时间相对于理想时间的变化。这种偏差会对电子系统的性能产生重大影响,尤其是在高速数字电路和通信系统中。 持续时间的...
另一种jitter是有界的,period jitter,也叫 cycle jitter。【刚才的cycle-to-cycle jitter叫什么?】周期的随机性偏离用平均值Tavg表示,这种类型的jitter,为: 可以看出,白噪声引起的抖动,Jc=Jcc/sqrt(2)。 表2.1概述了三种jitter的特点。The deterministics Jitter 可从输出的FM sideband获得;the absolute jitter对...
晶振的相噪与抖动Phase Noise and Jitter解释如下: 一个晶振在某一偏移频率处的相位噪声定义为在该频率处1 Hz带宽内的信号功率与信号总功率比值。 定义相位噪声是从能量角度来说的,指单位带宽内的功率与总信号功率的比,单位是dBc/Hz,所谓的单位带宽,是指偏离理想频点的单位带宽。 相位噪声是从频域的角度来评估这个...
This tool converts phase noise to phase jitter, period jitter, and cycle-to-cycle jitter. The resulting jitter values can be used to easily identify clocks and oscillators that meet the requirement. Need Help? Enter your values below
Phase Noise是描述信号频率稳定性的指标，通常用dBc/Hz（相对于载波的分贝）作为单位。Phase Noise与RMS Jitter之间可以通过以下公式进行换算：Phase Noise (dBc/Hz) = 20 * log10(Integrated Phase Noise / Carrier Frequency)其中，Carrier Frequency表示信号的载波频率，单位为Hz。假设有一个信号，其Carrier ...
Additional phase contamination in the output signal can be demodulated and used to regulate a level of the baseband signal used during modulation of the input signal. The output signal could have less phase noise or period jitter than the input signal.doi:US8750441 B2Lawrence H. Zuckerman...
There are different types of jitter: period jitter, cycle to cycle jitter, phase jitter, and peak to peak jitter. At IQD, we mainly specify the phase jitter which is calculated from a phase noise plot. It is important to note that all types of jitters describe the same phenomenon, but ...
Phase noise and timing jitter – Phase noise ? Measure of spectral density of clock frequency ? Units: dBc/Hz (decibels below the carrier per Hz) ? ? Analog people care about this – Timing Jitter ? Measurement of variations in clock transition edges with respect to reference ? Units: ...
在PLL设计中，jitter和phase noise是必须平衡的关键因素。不考虑phase noise的oscillator设计是不完整的。噪声分析的基础：噪声作为随机过程，其时域瞬时值不可预测。噪声的功率谱密度用于描述频域特性，是分析随机信号的关键工具。噪声类型和特性：电阻产生的热噪声。MOSFET产生的1/f noise和热噪声。噪声的...
Phase noise is a key parameter for many oscillators and signal sources as it governs many aspects of the overall performance.Phase noise can also be looked at as phase jitter they are two methods of looking at the same parameter: phase noise looks at the signal spectrum, i.e. in the ...