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hmc821lp6 vco issue at high temps

Dear sirs,

we have incorporated in a tranceiver design of ours the hmc821lp6 PLL&VCO part.

We have not noticed any systematic issues with that part in the product mass production phase, so far  .

However , recently 3 units have returned from one of our customers experiencing a PLL LD issue for temps >=aproax 40C.

PLL alm is real. When temp increases synth gets unlocked due to a VCo failure .

Please also note that during the issue's occurance , there is no signal at RF output even at a large frequency span.

At a specific temperature  range (temp > 40C) and while VCO is still alive, VCO output spectrum is full of non harmonic related spurs .

It seems that VCO malfunctions when temp increases for those parts.

I would appreciate your feedback on that issue.

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