Cadence Transformer dot convention and polarity (xfmr)

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SUMMARY

The discussion focuses on the challenges of implementing the dot convention for transformers in Cadence Virtuoso, specifically with the ideal transformer (xfmr) from the analoglib library. Users have identified that there is no direct method to change the dot convention within the software. One student suggested flipping the connections on one side of the transformer, while another proposed using a negative number of turns on the secondary coil to achieve the correct sign convention. Both methods are considered viable, though the latter may introduce complications in simulation.

PREREQUISITES
  • Understanding of transformer theory and dot convention
  • Familiarity with Cadence Virtuoso software
  • Basic knowledge of circuit simulation
  • Experience with analog components in circuit design
NEXT STEPS
  • Research the implementation of dot convention in transformer models within Cadence Virtuoso
  • Explore the effects of negative turns in transformer simulations
  • Learn about alternative methods for representing transformer polarity in circuit design
  • Investigate best practices for circuit simulation and analysis in Cadence tools
USEFUL FOR

Electrical engineering students, circuit designers, and anyone working with transformer models in Cadence Virtuoso who seeks to understand the implications of dot convention and polarity in circuit simulations.

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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