A good point - but what I didn't mention is that the testing I do is mostly DC parametric. Final test of packaged devices is done at GHz frequencies.

So 'wafer sort' treats any indication of passing as an excuse to let the DUT live another day and be finally tested at RF. Obvious failures are inked and not packaged.

There is no strong correlation between DC performance and RF performance.

In reply to Re^2: If at first you don't succeed ... by Anonymous Monk
in thread If at first you don't succeed ... by pavium

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