When we suspect if a io pad is broken, io curve tracing can help. Apply dc voltage to pad and ground and check current. VI current should be as shown for a normal pad. The rapid increasing currents at both pos and neg voltages are due to io #esd…[Read more]
A typical #xtal osc is shown. Two caps and xtal are external to chip. The op amp is inside chip. To board designers, that op amp driving strength is not fixed. They normally have higher driving strength at bootup to make sure xtal…[Read more]
Are we sure foldable is the next big thing? There is already suspect it doesn’t improve user experience much. If it doesn’t take off while erodes efforts of other features, maybe Apple is doing the right thing?