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LMX2594: Ramp speed

lu zhonglin
Prodigy 10 points
Part Number: LMX2594


Tool/software:

Hello,

I noticed that your company's LMX2594 chip has frequency scanning capability and I have some questions that need to be consulted. Firstly, how fast can the scanning speed of LMX2594 be? We hope to achieve the fastest possible scanning speed; Secondly, whether the relationship between time and frequency can be accurately predicted during the frequency sweep process, because we are not sure whether the VCO will automatically lock, how long it takes, and whether the switching of the frequency divider will cause discontinuity in the frequency sweep process. Finally, for example, if we want a ramp signal from 4G to 10G, how should we configure it to achieve a faster sweep speed? Can you explain the intermediate process so that we can calculate the relationship between time and frequency.

Looking forward to your reply, thanks!

  • 0
    TI__Guru** 112310 points

    Hi Zhonglin,

    If you need to sweep frequency between 4G to 10GHz, the frequency ramping function cannot support because the 4GHz is divided down output while 10GHz is direct output.

    You need to manually program the device to switch to the frequencies you want. That means you have to continuously programming the device to sweep frequency.

    We can use full-assist to reduce the frequency switching time. Check below application note for details.

    https://www.ti.com/lit/pdf/snaa336