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LMX2595: Lock Issues with Full Assist Calibration - Temperature

Part Number: LMX2595

Hello we are encountering locking issues at hotter and colder temperatures when using a full assist calibration done at 23C

It is bizarre because we can see the output become locked again on the spectrum analyzer when moving the temperature, and the output can be locked 1MHz steps away from the unlocked output

We can't quite figure out why this behavior is like this, but we are seeing improved results at cold/room when we do the full assist calibration at -40C (however it gets poor results at hot)

  • Hi Dylan,

    Are there specific frequency range have this problem?

    Could you monitor the Vtune voltage at different temperatures?

    Could you also share you loop filter design, fpd and charge pump current configuration?