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Original question:

LMX2595: LMX2595 :Generate frequency ramp from 10 GHz to 20GHz or ramp from 5-10GHz

LMX2595: LMX2595 Ramp

gu jiang
Prodigy 100 points
Part Number: LMX2595

Hello, I want to generate a ramp from 10G to 12GHz, recalibrating every 50MHz with a minimum VCO calibration time of 50us. The frequency remains constant during VCO calibration, as shown in Figure A. Or, as shown in Figure B, the  frequency is bouncing with time.

  • +1
    TI__Guru* 91990 points

    Hi Gu,

    During the 50µs calibration time, the VCO is calibrating so the output frequency is not correct and is bouncing. If you zoom out, you should see frequency glitch similar to below. 

    The above diagram used 500µs wait time (calibration time). The glitches are due to VCO calibration, after calibration, the frequency is stable and is ready for next ramp.