US 9,812,251 B2
Varainductor and operation method thereof based on mutual capacitance
Yi-Hsuan Liu, Hualien (TW); Hsieh-Hung Hsieh, Taipei (TW); Chewn-Pu Jou, Hsinchu (TW); and Fu-Lung Hsueh, Kaohsiung (TW)
Assigned to TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD., Hsinchu (TW)
Filed by TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY, LTD., Hsinchu (TW)
Filed on Oct. 12, 2016, as Appl. No. 15/291,520.
Application 15/291,520 is a division of application No. 14/132,301, filed on Dec. 18, 2013, granted, now 9,478,344.
Prior Publication US 2017/0032891 A1, Feb. 2, 2017
This patent is subject to a terminal disclaimer.
Int. Cl. H03L 7/06 (2006.01); H01F 27/42 (2006.01); H01F 21/12 (2006.01); H01F 27/28 (2006.01); H01F 27/40 (2006.01); H03B 5/12 (2006.01); H03L 7/099 (2006.01); H01F 29/02 (2006.01); H01L 23/522 (2006.01); H01L 23/528 (2006.01); H01L 23/58 (2006.01); H01L 27/06 (2006.01)
CPC H01F 27/42 (2013.01) [H01F 21/12 (2013.01); H01F 27/2804 (2013.01); H01F 27/40 (2013.01); H01F 29/02 (2013.01); H01L 23/528 (2013.01); H01L 23/5226 (2013.01); H01L 23/5227 (2013.01); H01L 23/585 (2013.01); H01L 27/0688 (2013.01); H03B 5/1212 (2013.01); H03B 5/1228 (2013.01); H03B 5/1256 (2013.01); H03L 7/099 (2013.01); H01F 2021/125 (2013.01); H03B 2201/0216 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A varainductor comprising:
a spiral inductor comprising a ring portion;
a ground ring surrounding at least the ring portion of the spiral inductor;
a floating ring disposed between the ground ring and the spiral inductor, wherein an inductance level of the varainductor is based on a mutual capacitance between the spiral inductor and the floating ring and a mutual capacitance between the floating ring and the ground ring; and
an array of switches, the array of switches configured to selectively electrically connect the ground ring to the floating ring.