Patent ID: 7091813

Claim:
An integrated circuit transformer comprising: a substrate for supporting multiple layers of an integrated circuit; a first metallization layer comprising a first set of turns of a primary winding of a transformer, and separated by a second set of turns of a first secondary winding of said transformer confined to said first metallization layer, each turn of said first secondary winding being separated by a winding of said first set of turns of said primary winding; a second metallization layer separated from said first metallization layer by an insulating layer, said second metallization layer comprising a second set of turns of said primary windings separated by turns of a second secondary winding confined to said second metallization layer; and a via connection connecting one end of said primary first set of turns to one end of said primary winding second turns, whereby a complete primary winding is provided using said first and second metallization layers, and said secondary windings are confined to said first and second metallization layers respectively.