Balanced planar transformers
AssigneeNorthern Telecom Limited
InventorGordon G. Rabjohn
Life of this patent
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Abstract
A monolithic transformer comprises two windings arranged in a plane with conductors of the windings interleaved with and crossing one another, whereby each winding is symmetrical with respect to a center point of the winding, to which a center tap connection can be made. The conductors of the windings and crossings therebetween can be arranged so that adjacent conductors belong to the different windings for maximum coupling. An unbalanced circuit can be connected between the center tap and one end of a winding, the other end electrically floating, to compensate for the effects of the unbalanced circuit on interwinding capacitance. The transformer can be constructed using air bridge technology with conductors supported by and spaced from a surface of a substrate.
Claims30
A planar transformer comprising two windings each having at least one turn, the two windings being arranged in substantially a single plane with conductors of the windings interleaved with and crossing one another whereby each winding is symmetrical about a line passing through center points of both of the windings, and a center tap connection to the center point of at least one of the windings.
A planar transformer comprising a first winding having at least one turn and a second winding having more than one turn, the two windings being arranged in substantially a single plane with conductors of the windings interleaved with and crossing one another whereby each winding is symmetrical about a line passing through center points of both of the windings.
A planar transformer comprising two windings each having at least one turn, the two windings being arranged in substantially a single plane with conductors of the windings supported by and spaced from a surface of a substrate, said conductors being interleaved with and crossing one another whereby each winding is symmetrical about a line passing through center points of both of the windings.
Dependencies are inferred from the claim text.