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JUNE 2020 I DESIGN007 MAGAZINE 33 If, while reading this column, you have had an idea for a useful signal integrity or stackup related application note, please get in contact. DESIGN007 Martyn Gaudion is managing director of Polar Instruments Ltd. To read past columns or contact Gaudion, click here. also worth speaking with the product special- ist and applications engineer at your supplier, as they are often in the best place to guide if a technical note has been superseded; perhaps they can also offer some useful secrets from in- siders, which are off the record. But a designer should use their own training mixed with com- mon sense, research, and theory combined with the information in the application note to gather information in a timely way to make the best possible design choices. Figure 4: Add on to timeless note on impedance expanding on insertion loss.