High coupling factor transformer and manufacturing method...

Inductor devices – Windings – Having conductor of particular shape

Reexamination Certificate

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C336S200000

Reexamination Certificate

active

07656264

ABSTRACT:
A high coupling factor transformer and a manufacturing method thereof are provided. The transformer includes a primary winding and a secondary winding. The secondary winding is adjacent to the primary winding. The secondary winding and the primary winding induct with each other. The primary winding includes a plurality of first protruding portions, and the secondary winding includes a plurality of second protruding portions. The first protruding portions stretch to the secondary winding without electro-contact, and the second protruding portions stretch to the primary winding without electro-contact.

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patent: 6577219 (2003-06-01), Visser
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patent: 6927664 (2005-08-01), Nakatani et al.
Heng-Ming-Hsu. “Implementation of High-Coupling and Broadband Transformer in RFCMOS Technology” published in Journal of Solid-State Circuit, vol. 52, No. 7, p. 1410-1414, Jul. 2005.
Alireza Zolfaghari et al. “Stacked Inductors and Transformers in CMOS Technology” published in Journal of Solid-State Circuit, vol. 36, No. 4, p. 620-628, Apr. 2001.
Kachun Kwok et al. “Ultra-Low-Voltage High-Performance CMOS VCOs Using Transformers Feedback” published in Journal of Solid-State Circuit, vol. 40, No. 3, p. 652-660, Mar. 2005.
Nam-Jin Oh et al. “11-GHz CMOS Differential VCO With Back-Gate Transformer Feedback” published in Microwave and Wireless Components Letters, vol. 15, No. 11, p. 733-735, Nov. 2005.
David J. Cassan et al. “A 1-V Transformer-Feedback Low-Noise Amplifier for 5-GHz Wireless LAN in 0.18-μm CMOS” published in Journal of Solid-State Circuit, vol. 38, No. 3, p. 427-435, Mar. 2003, of the Institute of Electrical and Electronic Engineers (IEEE).
Jian-Jun Zhou et al. Paper No. FA8.6, entitled “A Fully Integrated CMOS 900MHz LNA utilizing Monolithic Transformers,” of the International Solid-State Circuits Conference (ISSCC98).

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