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LMX2595EVM: Frequency and Time Resolution in RAMPING Mode

Ryan Lee TW
Intellectual 666 points
Part Number: LMX2595EVM
Other Parts Discussed in Thread: LMX2595

Hi Teams,

My customer want to use the LMX2595 to generate the LFM signal which range is  9GHz ~9.035GHz.

I'm wondering what's the frequency resolution and time resolution in this case? 

Thanks.

The configuration is as following with TICSpro:

  • +1
    TI__Guru** 108330 points

    Hi Ryan,

    During frequency ramping, the VCO frequency will change every phase detector cycle. Your fpd is 100MHz, that means the frequency will change every 10ns. 

    You want the VCO to ramp from 9000MHz to 9035MHz in 100µs. As such, the VCO will change frequency 100µ/10n times, that is 10000 times.

    The amount of frequency change per ramp is therefore equal to 35MHz / 10000 = 3.5kHz.