Node impedance measurement

[Fui]

Hi folks,

Is there anyone know, in the simulation testbench, how we can measure the impedance of the up/down network in a node, for instance, Z1 and Z2 as shown in the figure below?

Thanks,
Fui

 

[FvM]

You mean measure both impedances separately?
Generally it's quite simple, apply an AC voltage to the node, measure both branch currents separately. For Z2, you'll series connect a dummy resistor or zero voltage source to measure the current sum directly. Zx = V/Ix

If Pu drives the affected circuit also via other pathes, you need to disconnect left and right side of the node without changing bias.