• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 21 subscribers
  • Views 193 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMX2595: LMX2595

Akshay Sugandhi
Prodigy 50 points

Part Number: LMX2595

I have a few questions regarding the LMX2595 and its ramping capabilities:

  1. VCO Architecture
    Could you please clarify whether the LMX2595 uses a single VCO or multiple VCOs internally?
  2. Best Method for Frequency Sweeping
    I would like to sweep across a range of frequencies. Which approach would be the fastest and most reliable for this purpose: manual ramping or automatic ramping?
  3. Sweep Time Comparison
    What is the typical time required to sweep across a given frequency range using:
    •  Manual ramping
    • Automatic ramping
  4. Calibration Requirement
    Is calibration required every time the frequency is changed or during ramping, or can it be skipped under certain conditions?

I would appreciate your guidance on these points.

  • 0
    TI__Guru** 119830 points

    Hi There,

    There are 7 VCO cores in the chip.

    Would you tell us what is your requirement on frequency sweeping? 

  • 0 in reply to Noel Fung
    Prodigy 50 points

    Hello Noel Fung,

    Thank you for  your response !

    I am currently using the LMX2595 EVM with TICS Pro to perform frequency ramping. My objective is to achieve the maximum possible ramp speed. The frequency range of interest spans from 100 MHz to 20 GHz; however, this is being implemented in segmented steps rather than as a continuous full-range sweep.

    I would appreciate any guidance or recommendations you may have regarding optimizing the ramp performance

  • 0 in reply to Akshay Sugandhi
    TI__Guru** 119830 points

    Hi There,

    To sweep 100MHz to 20GHz, the ramp function of the device cannot support, you have to program the registers to change the frequency continuously. 

    Since you will need to use all VCO cores, VCO calibrations are required during the sweep, linear sweep is not possible.