• Limited IF output interface for Logarithmic Amplifier AD8309

    Sir/Madam,

        We are using your Log detector: AD8309 in our present module and planning to use it in upcoming module for the LOG as well as Limited IF output usage. Now we need the output interface circuit of the AD8309 for Limited IF signal to convert…

  • AD8309 Low-End Limiter Input, Output Limiter Jitter


    Hello AD,

    I'm using the Limiters exclusively in the AD8309 for their high dynamic range and low phase jitter in my application. I'm using the AD8309 Eval Board.

    I've noticed however that at small-signal input (somewhere around ~1-10mV) the Limiter…

  • AD8309 Logarithmic Amplifier Envelope delay at VLOG Output

    Sir/Madam,

          We are using the 0.625MHz (0.8uS ON and OFF) pulsed RF signal at 30MHz to the AD8309 Logarithmic Amplifier and take the Log envelope output at VLOG pin without any external capacitor at FLTR Pin(default 3.5MHz Video bandwidth).

    Can you specify…

  • AD8306, AD8309 limiting amplifier initial phase delay, pulsed RF

    Can the AD8306, AD8309 limiting amplifier initial phase delay can be estimated, with an input RF pulse applied. In other words, would the limiter phase response traverse the same phase plot, even though the input power is changing rapidly?

  • Query about AD8309's Output of Limiting Amp

    Hi, there

    I have a query about AD8309's output of limiting amplifier.

    We feeding 2 signals at 70.6Mhz with a amplitude difference of 4dB to the device and  observed that 
    amplitude difference 8dB at the output of limiting amplifier device.


    Input…

  • Limited IF output interface for Logarithmic Amplifier AD8309 - cont.

    Dear Suppoters,

        As per your recommendation, We have attached our finalized application schematic of AD8309 Log amplifier Log , Limited IF output circuit for 30MHz input to single ended 50Ohm Limited If output requirement.

    Kindly verify and give your…

  • AD8309, evaluating phase variation over input level, and over frequency

    Hi,

    A customer is asking whether the data of phase variation which is attached, is within the scope of specification of AD8309 ?

    Details how they measured is not known, but only information I have is they are evaluating AD8309 Evaluation Board, assuming…

  • [征文]AD8309对数放大器芯片的应用总结!

          最近在做一个接收机方面的项目,需要用到放大器芯片,刚开始听一个工程师说AD有一款芯片能放大100dB,抱着很高的积极性来了解这款芯片来作为自己接收机中频部分的放大。

           经过对芯片手册的了解以及询问相关的ADI的技术论坛上面的大神,终于对该款芯片有了新的认识,纠正一下自己对于这款芯片的错误认识,现在将其总结一下,希望对其他使用该芯片的一定的参考,如果那些地方还有不到位的地方请各位原谅指正!

    1、首先,100dB的认识上面有错误,AD8309虽然叫做对数放大器,但实质为检波器,用于射频信号功率检测…

  • 求助关于AD8309对数放大器在调试过程中出现的一些问题!!

    各位好!

    最近在调试AD8309对数放大器芯片,前两天刚焊接了一板电路,回来以后调试了几天,目前只能调试到62dB左右的放大倍数!

    手册上面是100dB的放大倍数,还有很远的距离要调试!

    我看了一下手册上面,貌似能调试的也就是第九管脚(LMDR)的外界电阻,个人理解该管脚外界电阻的大小对控制限幅输出影响很大,所以对于该管脚的外接电阻R调试的时候效果确实比较好!

    但是调试到62dB以后就一直没有效果了,而且还出现限幅的情况,目前最大的输出只有-7dBm,手册上面写的能够达到22dB,希望能够进一步的提高一下最大输出增益…

  • AD8309: How does this log amp handle out of band spurs (1800-2200 MHz)? Should additional filtering be added to attenuate spurs before it feeds into log amp.

    I have potential out of band spurs that are in the freq range of 1800 to 2200 MHz.  Spurs are at power levels of about -30 dBm