Hi ZoltanDTI,

thanks for your reply. Capacitive Load is no issue as it would imply when reading OPA202 datasheet. for me the output stage design is of most importance. So i have had a second look at the OpAmp table and could find OP249 which has an output…

AD8620A、AD8620B：同一型号的两个系列，B比A精度高。性能指标与OPA627差不多，只有一个大差别：带容性负载时的高频振铃现象比 OPA627好了很多。这使得AD8620更加适合应用在滤波电路中，这次测试用在CD的模拟滤波应该优势明显。AD8620BR：声音中性，各频段分析力极强。低音弹性很好，中频还原准确，高频极细致且不吵耳，所有细节历历在目。最突出的优点是优良的空气感，听起来真是一身贵气，有点象OP249加了一个音频激励器，令人换上去就不想拿下来，静静地陶醉其中。这是我所有运放中最中意的一款…

Hi !

Thanks for the prompt feedback, please find attached the ADIsimPLL file (renamed as *.txt instead of *.pll) and the configuration file we use with ADF4158/9/69 PLL Software (version v4.10.6 July 2015)

Hi, 

Let's work through each issue and see if we can get it to lock.

1) I suspect that the reason the part rails when you change the R divider value is that you aren't "re-training" the LD window. Each time the R divider is changed you need to tog…

问题：参考晶振有哪些要求？我该如何选择参考源？

答案：波形：可以使正弦波，也可以为方波。

功率：满足参考输入灵敏度的要求。

稳定性：通常用TCXO，稳定性要求< 2 ppm。这里给出几种参考的稳定性指标和相位噪声指标。

好资料，在一个论坛下载的，与大家相关的话，可以参考参考

Chapter 9 Hardware Design Techniques F.pdfHi XY,

let me respond to your questions:

If we use Buffer Mode, Output Additive Jitter is about 140fs. so total rms jitter for AFE ADC clocks should be roots.quare(100*100+140*140+54*54) = 180.3fs rms. Is my perception…