Using ADF4159 for a CW Radar application

Hi,

im studying electrical engineering at RWTH Aachen. Right now im doing my master thesis at the Chair of High Frequency Electronics.
For my thesis I'm going to develop a radar system which will be used for tracking purposes.
At the moment im trying to figure out what parts I'm going to need for my application.
While researching, I stumbled upon the ADF4159(https://www.analog.com/en/products/adf4159.html), which I want to use as a PLL for my frequency synthesis (the PLL will be used in combination with the ADF5901). As im going to develop a continuous radar, my main goal with this PLL is to operate it at a costant frequency. While studying the datasheet, I was able to spot that there is a register (DB31; p.15) for using/disabling a "Ramp On"-function.
So here is my question: If i set the "Ramp On"-Bit to zero, will the PLL operate at a constant frequency instead of functioning as a FMCW?
And if thats not the case, could you recommend a different PLL for my desired purpose? I would be absolutely grateful if you could enlighten me on this matter. Thanks in advance! Sincerely yours Niklas
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  • 0
    •  Analog Employees 
    on Nov 20, 2020 2:43 PM

    Yes, if ramping is disabled then ADF4159 will lock the ADF5901 output to a constant frequency.

    If you don't require the ramping features of ADF4159, you might consider using ADF5902 for your system. This is a 24 GHz FMCW radar with integrated PLL, but the ramping feature can also be turned off to lock the output to a constant frequency.

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  • 0
    •  Analog Employees 
    on Nov 20, 2020 2:43 PM

    Yes, if ramping is disabled then ADF4159 will lock the ADF5901 output to a constant frequency.

    If you don't require the ramping features of ADF4159, you might consider using ADF5902 for your system. This is a 24 GHz FMCW radar with integrated PLL, but the ramping feature can also be turned off to lock the output to a constant frequency.

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