On-chip transformer balun

Inductor devices – Coil or coil turn supports or spacers – Printed circuit-type coil

Reexamination Certificate

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Details

C336S223000, C336S232000

Reexamination Certificate

active

07456721

ABSTRACT:
The invention provides an on-chip transformer balun formed among N successive isolating layers. The transformer includes a primary winding and a secondary winding. The primary winding includes a plurality of first semi-turn coils, a plurality of second semi-turn coils, a plurality of metal junctions, and a plurality of first metal bridges. The secondary winding includes a plurality of third semi-turn coils, a plurality of fourth semi-turn coils, and a plurality of second metal bridges. The first semi-turn coils are connected with the second semi-turn coils by the metal junctions and the first metal bridges. The third semi-turn coils are connected with the fourth semi-turn coils by the second metal bridges. By use of the multi-layer first metal bridges, the transformer according to the invention allows a larger input current than a conventional on-chip transformer.

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patent: 6476704 (2002-11-01), Goff
patent: 6608364 (2003-08-01), Carpentier
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A Fully Integrated 5.3-GHz 2.4-V 0.3-W SiGe Bipolar Power Amplifier With 50-Ω Omega Output, IEEE Journal of Solid-State Circuits, vol. 39, No. 7, Jul. 2004.

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