差异 - 输出VCXO定义和技术值本文引用：在400G/800G光学模块的56Gbaud PAM4调制系统中，抖动时钟中每0.1PS RMS增加300％。由于通常干扰了模式的噪音，因此很难满足高速Serds对相位稳定性的严格需求。差异-VCXO输出（由晶体振荡器控制的电压）通过对称差信号-IR（LVDS/HCSL）实现标准的噪声抑制模式。结合±50ppm频率微调功能，相位抖动被压缩到0.7PS RMS以下，这已成为高速光学通信系统的“心率”。差异架构的示意工程突破的结果1。抗噪声的革命设计●双线的取消机制：对面对（D+/D-）输出幅度相等，POLA是相等的rity is opposite, which can offset more than 90% of power supply/ground noise ● Impedance matching optimization: 100ω Impertance Variety Moving function: of phase 20dbc/hz@100khz offset (actually measured data) 2. Ultra-low Jitter Core Technology Note: Based on 156.25MHz Frequency Point Test Data, it meets three main applications of IEEE 802.3ck Standard Optical Communication System 1. VCXO directly to DSP芯片：牵引牵引力结论：温度漂移付费±50ppm（±0.8V调音电压）付费●常见调整：156.25MHz LVDS输出，相位噪声-150DBC/HZ@1MHz2。连贯的光学通信系统中的高速ADC/DAC采样时钟：●驾驶64GSA/S ADC时，INL（积分非线性）提高了40％●与相锁循环集成时，实现了FS级别的抖动，并获得了EVM（erry evector Amplitude），并改善了3DDB3。 PHY层芯片参考时钟为56G PAM4 Serdes提供时钟：●消除确定性抖动引起的by Transmission Line Crosstalk ● Support -40 ℃ ~+85 ℃ Full -Temage Domain Frequency Deviation ± 2PPM mainstream solution parameter horizo??ntal Eviation Indicators of Optical Communication Differential VCXO Technology Trend Analysis: Sitime Mems Solution: Compress the temperature drifting to ± 0.1ppm/℃ with Semiconductor technology ● NDK ultra-low jitter technology: sc-cut crystal, close to carrier phase noise is more m more mbetter than -130dbc/hz@100Hz ● Rakon Phase Vibration Resistance Design: Vibration Sensitivity 0.1PPB/G, Adapting to the Harsh Environment of the Base Station, Package and Power Compatibility Innovation 1. ● Metal Shielding Cavity: Separate External EMI Interference, Shielding Efficiency 60DB ● Bottom Thermal Pad: Thermal resistance drops to 15 ℃/w, temperature increases从40％2。功率适应性突破●广泛的电压电压：2.5V/3.3V双模式匹配●PSRR优化:: 80DB@100KHz电源供应波型抑制比例●智能启动电路：智能启动电路：SS强力刺激并避免时钟的故障和选择黄金规则1。●2000 2000热冲击（-55℃+125+）频率偏差±0.5ppm结论：准确性同步期间的核心发动机定制输出VCXO成为800G OpticalModules和56G Serimeter system of Expriise jitter System，Ulter Erovers and Erovers systerm of Outs sermets system of Ulter sermets Wave of Ulter Erovers and of Erovers system of Electires and of Erovers systerm of Ulter sermets systerm a in Ulter sermets syster功能。 With the breakthrough of silicon-based MEMS-based technology, VCXO's new generation will achieve a limited 0.3Ps Jitter in the 1.6T optical communication period, and will provide a full-system synchronization solution for CPO (co-packaged optical) architectural with a multi-channel output version (like 4-flesh-hand When optical communication enters the 800g/1.6T era, the "clock heart" of less than 5mm2 will be the winner of系统性能。