• RE: Is there any AD8309 spice model or how to simulate AD8309?

    Hello Vickers, sorry we do not have LTspice model for AD8309 at this time.   -Bruce H. 

  • AD8309: Limiter Amplifier

    Could you give me more information on the Limiter Amplifier?


    The AD8309 can provide a large voltage gain combined with
    progressivecompression, through which an IF signal of high dynamic range is
    converted into a square-wave (that is…
  • FAQ: AD8309 Limiter impedance


    What is the impedance of the limiter in the AD8309?



    The limiter used in the AD8309 is an open collector circuit. The impedance is determined by the…

  • AD8309: Overshoot atfer rise time

    I use a AD8309 in RSSI mode.
    There is an overshoot after the rise time: Why ?


    The overshoot you have observed is basically the nature of the AD8309 output
    stage, it takes a few moments to settle. There are one of two things to deal
  • FAQ: AD8309 Limiter output swing


    As per the AD8309 data sheet the limited output VLIM = VS – 400 mV × RLOAD/RLIM (data sheet page no:17). In our design we have RLOAD=499 ohms & RLIM = 402 ohms. For this we are getting 250 mV output in each pin. It didn't match with the given relation…

  • Reducing AD8309 RSSI baseline

    On page 11 of the AD8309 datasheet,

    The output has a minimum level of about 0.34 V (corresponding

    to a noise power of –78 dBm, or 17 dB above the nominal intercept

    of –95 dBm). This rather high baseline level ensures that the pulse

    response remains…

  • Query about AD8309's Limiter Output

    Hi, there

    i have some queries about AD8309. i want to use it for logarithmic amplification with its limiter output.

    when i read the datasheet, it shows the gain should be 72dB(six-stage total gain) + 18dB=90dB. my first questions are:

    1, does it mean…

  • AD8309 Limiter-Output Duty Cycle

    Hi Analog Devices,

    I'm seeing issues with the AD8309 Limiter outputs duty cycle as I approach smaller signal (and still a bit away from the noise floor) and can see significant component-to-component AD8309 variation.

    In my application I am exclusively…

  • AD8309 放大功能 问题


    我的AD8309 PCB    VLOG(RSSI脚)输出正常, 但测 INHI、INLO和LMHI、LMLO的S21参数,增益不对啊,-50dBm输入时 增益 1.5dB左右, 输入功率再大点,增益就是负的了。电路图 如图。。  其中LO_R8用的是 43Ω,请大神们不吝赐教啊,给个建议。  不胜感谢!

  • AD8309 out of band spurs

    Out of band spurs from 1800 to 2200 MHz can potentially be seen at the input.  Any issues with  this since the log amp only operates up to a maximum of 500 MHz?