Electrical – Why is this LTSPICE model not working


How do I simulate the above circuit in LTSPICE? The way I have it set up right now gives me a singular matrix error which I don't understand. Vi is a AC signal with a frequency of 100kHz and a small amplitude of less than 10mV.

Circuit image

SPICE ciruit


Best Answer

Obviously, B1 has no return path. That arrow on top is ground but it's a different node than the ground you use on the bottom of the schematic.

Change the arrow type ground on top (COM) to the closed triangle type ground (node 0) and you'll be OK.