Vertical transformer

Details Vertical transformer Vertical transformer

2000-11-03

2002-12-31

Mai, Anh T. (Department: 2832)

Inductor devices

Coil or coil turn supports or spacers

Printed circuit-type coil

C336S232000, C336S223000, C029S602100

Reexamination Certificate

active

06501363

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the integrated circuits, and in particular, to transformers and a system and method for analyzing the same.
BACKGROUND OF THE INVENTION
Transformers are widely used in electrical and electronic engineering for the purpose of voltage, signal or impedance transformation. In high frequency integrated circuits or microwave monolithic integrated circuits (MMICs), transformers are usually used in low-noise amplifiers (LNA), doubly-balanced mixers, or voltage-controlled oscillators (VCO). More particularly, coplanar microstrip, stripline couplers, or coplanar transformers are commonly used in applications where signals need to be coupled at different voltage or phase levels or the impedance of a terminator needs to be transformed to another level. Typical designs for such applications involve transformers having primary and secondary windings that are configured on the same plane. Although operable, these typical designs of coplanar transformers are found to occupy a large area of a chip on which they are fabricated, thus, leading to an inefficient manufacturing process.
SUMMARY OF THE INVENTION
The present invention provides a vertical transformer that comprises a primary and a secondary winding, wherein one winding is positioned on a first plane, and the other winding is positioned on a second plane. The primary and secondary windings are separated by a dielectric substrate. In one embodiment, the primary and secondary windings are configured to use the same ground reference, and terminals in the center of each winding are connected to the ground reference by a via hole to form an in-phase transformer. In a second embodiment, a center terminal of one winding and an outbound terminal of the other winding are connected to the ground reference to form an opposite-phase transformer. In the second embodiment, a dielectric substrate is positioned between one of the windings and a ground plane.


REFERENCES:
patent: 4253231 (1981-03-01), Nouet
patent: 4598276 (1986-07-01), Tait
patent: 5095357 (1992-03-01), Andoh et al.
patent: 5202752 (1993-04-01), Honjo
patent: 5386206 (1995-01-01), Iwatani et al.
patent: 5402098 (1995-03-01), Ohta et al.
patent: 5515022 (1996-05-01), Tashiro et al.
patent: 5566083 (1996-10-01), Fang
patent: 5949299 (1999-09-01), Harada
patent: 5973653 (1999-10-01), Kragalott et al.
patent: 6054914 (2000-04-01), Abel et al.
patent: 6064810 (2000-05-01), Raad et al.
patent: 6198374 (2001-03-01), Abel
Engels, M., and R.H. Jansen, “Modeling and Design of Novel Passive MMIC Components with Three and More Conductor Levels,”IEEE MTT-S Digest, pp. 1293-1296, May 1994.
Koh, D., and T. Itoh, “A Hybrid Full-Wave Analysis of Via-Hole Grounds Using Finite-Difference and Finite-Element Time Domain Methods,”IEEE Trans. MTT, vol. 45, No. 12, pp. 2217-2222, Dec. 1997.
Piket-May, M., et al., “FD-TD Modeling of Digital Signal Propagation in 3-D Circuits With Passive and Active Loads,”IEEE Trans. MTT, vol. 42, pp. 1514-1523, Aug. 1994.
Zhou, J.J., and D.J. Allstot, “Monolithic Transformers and Their Application in a Differential CMOS RF Low-Noise Amplifier,”IEEE Journal of Solid-State Circuits, vol. 33, No. 12, 2020-2027, Dec. 1998.

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