Semiconductor device comprising windings constituting inductors

A semiconductor device with an integrated circuit made in several layers, the integrated circuit comprising:

• a metal circuit with two or more secondary metal windings formed from
• two parts wound into spirals which have inner ends and outer ends connected by one or more branches which lie on either side of a median longitudinal region;
• and
• one or more successive branches which are connected by intermediate junctions crossing the median longitudinal region;
• wherein the two parts wound into spirals are formed in a same layer such that the branches of one of the two parts and the branches of the second of the two parts lie on either side of the median longitudinal region and the two parts are symmetrical with respect to the median longitudinal region;
• a common junction connecting the inner ends of the two parts and lying across median longitudinal region, the common junction formed so that the intermediate junctions between the branches of one of the two parts passes above or below the intermediate junctions between the branches of the second of two parts;
• at least one common external connection means connected to the common junction;
• two or more separate external connection means connected to the outer ends;
• and
• a primary metal winding coupled to the metal circuit;
• wherein the secondary metal windings are symmetrical and electrically formed between the common external connection means and the separate external connection means, respectively, and constitute symmetrical inductors;
• wherein the primary metal winding is formed in at least one layer different from the layer with the two secondary metal windings.