Can anyone give details on how the snubber network (referenced on page 16 of the datasheet) values were determined? Is there a way to optimize these based on input frequency?
I think it was equal parts Intuition and Trial & Error. The RL snubber network given in the datasheet is just an example and it does not always work. I have seen it not be effective on some Roger's PC boards (I think it has something to do with the lower loss dieletric; at least lower loss than FR4).
It is tuned for the operating frequency ranges of the AD8368. At the lower frequencies, the signal energy should pass right through the inductor. As frequencies increase outside the working range of the AD8368, the reflections should get snubbed out by the inductor & resistor parallel combo, where the resistor essentially sets the snubbing impedance.
Is a customer having trouble with the AD8368 oscillating?
Yes, especially at high temperatures. His frequencies of interest are ~ 127-129MHz.
They could try placing a bigger resistor in the RL network, although this would increase the loss a bit.
What is the material of the board they have the part mounted on? Rogers?
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