Hello,
What is HMC4069's noise @ +10 Hz, ( Pll locked @ 100 MHz from 10 MHz reference)?
Our reference is -145 dBc/Hz @ +10 Hz, loop filter is 200 Hz width (active filter using THS4031).
We are measuring -110 dBc/Hz, while our simulation on simpll predict…
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HMC4069搭配HMC385的环路带宽，用了TI的OPA211运算放大器，仿真的时候是可以，但是实际测试时环路带宽达到1M以上，运放就会出现自激，为什么呀
大家好：
我看HMC4069的数据手册中推荐了有源环路滤波器，但我实际用的VCO的tune电压约为2.5V。
1.现在按照数据手册有源电路设计的环路滤波器，放大器为ADA4625-1，其他值都和手册一样，HMC4069的参考为30.72MHz/sine/0dBm，VCO输入约为122.88MHz/sine/dBm，A0和A1为高测了约为3.1V（即4分频），供电5V/0.3A，但现在环路一直没有锁定，VCO的tune一直是4.8V，检查了好久没找到原因，请问有源环路输出2.5V是可以的吗？
2.可以用无源环路吗…
大家好：
我用adisimpll仿真hmc4069手册中的有源环路，参数设置和给的一样，但为什么环路仿真的值和手册给点的不一样？
同样是100k环路，仿真中也设置了是hmc4069,其他参数都一样，但值不一样？手册中是有优化过吗
I bought a HMC4069 evaluation board last month. It has 5 bit control pins which decide the frequency division ratio.
With A0-A4 1/0/0/0/0, it has to work with 1/2 ratio but failed. It doesn't work with 0/1/0/0/0, either. It works with A0-A4 1/1/1/0/0…
Closing this out due to lack of reply
Hi! I want to use an external VCO as the input of HMC4069(VCO), but i don't know how to design the circuit for the Vtune of the external VCO. How to get the Vutune needed loaded on the external VCO. Can anyone give some suggestions on this?Thanks a l…
hmc4069 PD output : +/-5V (pin NU, ND)， charge pump current is 10mA;
suppose vco tuning voltage is 0~15V.
As you see, they are not equal , and the latter（15V） is higher than former（5V)
As the datasheet recommemded , the loop filer is one op circuits …
