There is a question of how the lower "wire" of the balanced line connects to your circuitry, and then to ground. That includes having no noise, so that GND1 = GND2. If so, there might be an unknown amount of "noise" between GND1 and GND2. The balanced transmission line suggests that the TX and RX ends might be considerably far apart. Tarani asked about using two different grounds in a simulation, and uploaded a conceptual picture. (3) Connect the "isolated ground" to a variable voltage source to ground, where you can set the voltage source to several voltages over some range (maybe -10KV to +10KV) to satisfy yourself that it works even if the isolated section is at a different voltage. But if the section was completely isolated, then there would be zero current through the resistor, so zero voltage drop across it, so you might as well do (1). (2) Connect the "isolated ground" through a large (1MEG or 1G) resistor to ground. (1) Connect the "isolated ground" to ground anyway. So we have to add a connection to Ground anyway. If a section is truly isolated, then that would be impossible. SPICE has to calculate the voltage of every point relative to Ground. You have to add a connection to Ground even if the real circuit doesn't have one. There is only one Ground in SPICE and LTspice.Ĭan I ask, what are you really asking? Do you want to use two ground symbols? Is it for something like "Digital Ground" and "Analog Ground"? When someone has Digital Ground and Analog Ground, the two are not really different, because they eventually connect together they are both Ground.Īre you asking because there is a section of your simulation which is isolated (maybe using an isolation transformer) so it really is separate from Ground? SPICE can't have sections that are completely isolated. If you do not allow these cookies, you will experience reduced relevant content."Please suggest, how can i use two different grounds in LTspice."(I wonder if Helmut mis-read and thought you wrote "groups".)
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