Engineering Cadence Transformer dot convention and polarity (xfmr)

AI Thread Summary
In Cadence Virtuoso, users face limitations with the dot convention for ideal transformers, as there is no option to change it directly. One student suggested flipping the connections on one side of the transformer to address the issue, while another proposed using a negative number of turns on the secondary coil to indicate the winding direction. Both methods appear to yield correct sign conventions, but the reliability of the negative turns approach is uncertain due to potential software limitations. The original poster is seeking clarification and assistance, as they lack familiarity with transformer behavior to validate simulation results. Overall, both methods may be viable, but the flipped connection might be the safer choice.
garthenar
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Homework Statement
2. Use Cadence to simulate figure 13.38 in the book and the frequency is 10Hz. You need to plot (1) I1 and I2 in the same plot. (2) V0

Hint: 1. The voltage is amplitude, not AC magnitude
2. Ideal transformer is xfmr in Cadence
3. Use transient analysis

(See body for circuit)
Relevant Equations
Equations for ideal transformers.
V2 = nV1
I2 = (I1/n)

n = (N2/N1)
Here is the circuit...
1618181637446.png

Here is my work so far in cadence (I haven't put in values for other components in because the moment I saw the dot convention I started trying to figure that out).
1618180542036.png


Where I'm at
-There apparently isn't a way in Cadence Virtuoso (the program my class uses) to change the dot convention of the ideal transformer (xfmr in analoglib).
- Another student on the class discord said they "just flipped the right side of the circuit". I'm assuming they mean they flipped how that side is connected to the transformer.
- I went another route and decided to have a "negative" number of turns on my secondary coil to represent the alternate direction of the windings. The equations above work out to the right sign convention if I do this. (or at least I think).

I can't just run the simulation and pick the "best looking" result because I'm not familiar enough with transformers to know what I'm looking for.

At first I thought The other students method was completely wrong, but now that I look at it I think both methods might work. Though there's might be the best to go with because I don't know if the program will like that negative sign.

Any help would be appreciated.
 

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