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https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> Magnetic field in the center of an on-chip transformer https://designers-guide.org/forum/YaBB.pl?num=1410918792 Message started by Nath on Sep 16th, 2014, 6:53pm |
Title: Magnetic field in the center of an on-chip transformer Post by Nath on Sep 16th, 2014, 6:53pm Hi, I have a fundamental question about the magnetic field in the center of an inter-wound symmetric monolithic transformer. As I understand it, the built in phase inversion from the primary to secondary of an inter-wound (lateral) transformer results in ZERO magnetic field at the center. This is quite contrary to a spiral inductor whose field is strongest in the center. Does this make sense or am I not looking at this correctly? Regards, Nath |
Title: Re: Magnetic field in the center of an on-chip transformer Post by loose-electron on Sep 17th, 2014, 8:09am care to provide a picture of what you are talking about? |
Title: Re: Magnetic field in the center of an on-chip transformer Post by aaron_do on Sep 18th, 2014, 4:28am Hi Nath, I believe your reasoning is correct. The currents in the primary and secondary will be going in the opposite direction and the magnetic fields which they produce will cancel at the center of the transformer. Aaron |
Title: Re: Magnetic field in the center of an on-chip transformer Post by totowo on Nov 13th, 2014, 11:25pm According to Lenz's law, the secondary current is really trying to cancel the magnetic flux, but it is always more 'weak' to cancel all. :) Nath wrote on Sep 16th, 2014, 6:53pm:
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