Hi, How is power defined in pss analog simulation? Thanks all. Fredo
Your question is a little non-specific! If you're asking about how to define input power, then this is not really anything to do with pss, but to do with how you set up your input sources. The "port" component (in analogLib, corresponding to the "port" component in spectre) can specify the input signal in dBm since it has a built in resistance. If you're talking about measuring output power, then ADE gives you a number of options - if you look on the direct plot form (Results->Direct Plot->Main Form), then there are several choices whenever you try to plot anything power related. For example, you can select a port - and it knows what the impedance of the port was, so can convert the voltage to power. Or you can specify the terminal of a device - in which case it will use the current and voltage to compute power (you need to save the current if you want to do that). Or there are several other options. Without knowing what you're actually asking, it's hard to answer your question more precisely! Regards, Andrew.
I found that the power obtained by integrating the product of voltage and current in one cycle in a transient simulation has large deviation to the power obtained from the pss plot option. So I wonder if it is a mistake in my calculation, a wrong assumption or that pss has a special definition to power. Sorry that I didn't make it more specific. I almost thought that it might be a naive question to post in here. fredo
Without knowing how you're measuring the power in both situations, it's hard to know what could be wrong. Are you summing up the power in all the harmonics? Are you measuring the power the same way? A bit more information might make this possible to answer... there's no fundamental reason why it should be wrong. Regards, Andrew.
