*注意, 之前的 S(t) 中实际上调制因子 m 也代表了信号的最大相位偏移,因此可以得到 jitter 和 spur 的量化关系:例如,若已知 peak-peak 的 deterministic jitter 为0.01UI, 则对应的最大相位偏移 m=0.01*0.5*2*Pi, 因此 P_spur=20log(m/2)=-36dBc PLL 中 reference spur 的计算 PLL 中的 reference ...
请问PLL仿真时的spur frequency是什么意思?谢谢 基本的东西还是要多看看书 杂散频率,主要指鉴频泄露阿 申明:网友回复良莠不齐,仅供参考。如需专业帮助,请学习易迪拓培训专家讲授的ADS视频培训课程。
then Fspur(k) = Fref*k/2*2^n, k=0,1,2,3 n 很大时,Fspur非常密集,且平坦,不存在大的spur if M is event 那么L 明显小得多,因此会产生周期性比较明显的spur。 例如: X=2^24, M=1426064 , gcd(2^24,1426064)=16 fspur1=k*fref /(2*(M/16)) M=1426063, gcd(2^24,1426063)=1 fs...
Knowing how to predict reference spur level helps pick loop parameters wisely during the early stages of a PLL system design. The phase locked loop (PLL) is a negative feedback system that locks the phase and frequency of a higher frequency device (usually a voltage controlled oscillator, VCO)...
December 2013 A Simple Method to Accurately Predict PLL Reference Spur Levels Due to Leakage Current Michel Azarian and Will Ezell Presented is a simple model that can be used to accurately predict the level of reference spurs due to charge pump and/or op amp leakage current in a PLL system...
To reduce the reference spur, a low current-mismatch charge pump is carefully designed. A quasi-closed-loop auto frequency control circuit is used to accelerate the lock process of PLL. The PLL is fabricated in 180 nm CMOS Mixed-Signal process while it operates under 1.8 V supply voltage. ...
A leakage current reduction technique is proposed for the pull-down network (PDN), which is used to hibernate the Phase-locked loop (PLL). Due to low leakage current, the PDN results in a PLL with lower reference spur. The switch leakage is minimized by biasing the MOSFET with VGS <; ...
The circuits are designed in TSMC 65nm process, and consume 0.81 mW from a 1.2-V power supply. In simulations, the PLL exhibits an in-band phase noise of 112dBc/Hz at a 100-kHz offset, a reference spur of 72.2 dBc, and a lock time of 2.6s. 展开 ...
https://www.youtube.com/watch?v=sgPDchYhN-4&t=1s Low-Spur PLL Architectures and Techniques Mike Shuo-Wei Chen, University of Southern California One key design objective of a frequency synthesizer is to minimize the spurious tones, as they can degrade the overall jitter performance or cause ...
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