• HMC4069芯片使用问题

    打算使用HMC4069芯片搭建线性调频连续波的源,目前有两个疑惑点:

    1、HMC4069外置有源环路滤波器,按照手册推荐的形式(供电电压改至20V),是否可以达到18V的Vtune电压;

    2、HMC4069芯片是否支持快速扫频功能?目前设计是固定分频,扫参考频率REF(90kHz/us),芯片是否可以跟上?

    谢谢。

  • HMC4069搭配HMC385的环路带宽调节

    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

  • RE: HMC4069:Output signal unlocked

    Closed this one out from lack of activity 

  • HMC4069一定要用推荐的有源环路吗?

    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…

  • adisimpll仿真hmc4069中有源环路值和手册不一样

    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

  • HMC4069 Evaluation board switch control

    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…

  • HMC4069 How to use it with external VCO

    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…

  • A question about hmc4069 (PLL) loop filter design, can active op circuits convert +/-5V pulse signal to 15V (likewise) tuning voltage?

    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 …

  • HMC4069的环路滤波器相位裕度为什么是70度?

    大家好:

    最近打算用HMC4069 PLL,但看手册发现推荐的电路中环路的相位裕度为70度,根据自己了解为了保证系统稳定,相位裕度一般在45度左右,为什么推荐电路中设置到了70度,会对系统有影响吗?看仿真的相噪曲线确实是会好一点。

    若自己再仿真其他带宽的环路滤波器,都需要将相位裕度设置到70度么?