Transformer of the balanced-unbalanced type
First Claim
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1. A transformer comprising:
- a primary winding;
a secondary winding; and
an additional winding surrounding the primary winding and the secondary winding, the additional winding being inductively coupled to the primary winding and the secondary winding, wherein the additional winding is coplanar with the primary and secondary winding, and wherein the additional winding is electrically directly connected in parallel with the secondary winding, wherein at least two turns of the additional winding surround a portion of an outermost turn of each of the primary and secondary windings.
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Abstract
A transformer of the balanced-unbalanced type includes a primary inductive circuit and a secondary inductive circuit housed inside an additional inductive winding connected in parallel to the terminals of the secondary circuit and inductively coupled with the primary circuit and the secondary circuit.
25 Citations
21 Claims
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1. A transformer comprising:
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a primary winding; a secondary winding; and an additional winding surrounding the primary winding and the secondary winding, the additional winding being inductively coupled to the primary winding and the secondary winding, wherein the additional winding is coplanar with the primary and secondary winding, and wherein the additional winding is electrically directly connected in parallel with the secondary winding, wherein at least two turns of the additional winding surround a portion of an outermost turn of each of the primary and secondary windings. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device comprising:
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an antenna; a first circuit; and a transformer coupled between the antenna and the first circuit, the transformer comprising; a primary winding; a secondary winding inductively coupled to the primary winding, the secondary winding having a first terminal and a second terminal; an additional winding inductively coupled to the primary and secondary windings, the additional winding having a first terminal and a second terminal; a first capacitor electrically directly connected between the first terminal of the secondary winding and the first terminal of the additional winding; and a second capacitor electrically directly connected between the second terminal of the secondary winding and the second terminal of the additional winding, wherein at least two turns of the additional winding surround a portion of an outermost turn of each of the primary and secondary windings, and wherein the primary, secondary, and additional windings are formed in a plurality of metal levels. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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coupling an antenna to a reference terminal via a primary winding of a transformer; coupling a secondary winding of the transformer to an additional winding of the transformer, the additional winding of the transformer being coplanar with the primary and secondary winding of the transformer and surrounding the primary and secondary winding of the transformer wherein at least two turns of the additional winding surround a portion of an outermost turn of each of the primary and secondary windings; differentially coupling the additional winding of the transformer to a first circuit; and polarizing the first circuit without polarizing the secondary winding by; electrically directly connecting in parallel a first capacitor between a first terminal of the secondary winding and a first terminal of the additional winding; electrically directly connecting in parallel a second capacitor between a second terminal of the secondary winding and a second terminal of the additional winding; and providing a voltage to a tap of the additional winding. - View Dependent Claims (19, 20, 21)
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Specification