wizardyhnr
Junior Member level 3
during simulation of a lna operating from 3~3.5 GHz, i find that the stability of the lna is very sensitive to the inductor of bondwire which ground the chip substrate. if there is no inductor of bondwire, then the lna works perfect. But if the bondwire inductor reaches 0.4nH, then the lna doesn't maintain unconditional stable and power gain drops.
so it is very important to minimize the bondwire inductor of the substrate ground. a bigger pad can attach several bondwires and provide small bondwire inductor. Yet i think this is not enough. how can i minimize a smaller bondwire inductor? What if i add several substrate ground pads, each of which can attach three bondwires(then three pads can attach nine bondwires)?
so it is very important to minimize the bondwire inductor of the substrate ground. a bigger pad can attach several bondwires and provide small bondwire inductor. Yet i think this is not enough. how can i minimize a smaller bondwire inductor? What if i add several substrate ground pads, each of which can attach three bondwires(then three pads can attach nine bondwires)?