Inductor layout using step symmetry for inductors

Details Inductor layout using step symmetry for inductors Inductor layout using step symmetry for inductors

2007-07-10

2007-07-10

Nguyen, Tuyen T. (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

Reexamination Certificate

active

10836160

ABSTRACT:
A differential circuit layout can advantageously use step symmetry for inductors and mirror symmetry for the rest of the circuit. Interconnect segments can be used to connect the terminals of the inductors to other components in the circuit. These interconnect segments facilitate the transition from the step symmetry of the inductors to the mirror symmetry of the other components. To provide this transition, the terminals of an inductor and its associated interconnect segments are formed on a middle axis of the inductor. This mixed symmetry can advantageously cancel the common-mode magnetic field, reduce the parasitic inductor coupling, and balance parasitic wiring capacitances between the two sides of the differential circuit.

REFERENCES:
patent: 4959631 (1990-09-01), Hasegawa et al.
patent: 5884990 (1999-03-01), Burghartz et al.
patent: 6943658 (2005-09-01), Gardner
Burghartz et al.: “RF Circuit Design Aspects of Spiral Inductors On Silicon”, IEEE Journal of Solid-State Circuits, vol. 33, No. 12, Dec. 1998, pp. 2028-2034.
Yue et al.: “Design Strategy of On-Chip Inductors for Highly Integrated RF Systems”, Invited Paper, DAC New Orleans, LA 1999 ACM 1-58113-092-9/99/0006, pp. 982-987.
Greenhouse: “Design Of Planar Rectangular Microelectronic Inductors”, IEEE Transactions On Parts, Hybrids, and Packaging, vol. PHP-10, No. 2, Jun. 1974, pp. 101-109.

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