公开(公告)号：US09685908B1

公开(公告)日：2017-06-20

申请号：US15207470

申请日：2016-07-11

Applicant: SOONGSIL UNIVERSITY RESEARCH CONSORTIUM TECHNO-PARK

Inventor： Mi Lim Lee ,  Ga Yeon Ko ,  Chang Kun Park

IPC: H03B5/12

CPC classification number: H03B5/124 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1253

Abstract: The present invention related to a varactor used in an integrated circuit of a differential structure. An exemplary embodiment of the present invention provides a variable capacitor connected between first and second signal lines which are differential signal lines included in an integrated circuit of a differential structure, including: a plurality of N-type semiconductors separately arranged; one or more P-type semiconductors disposed between the N-type semiconductors to make first and second PN junctions with N-type semiconductors contacting upper and lower portions thereof and to receive a control voltage, wherein, among the N-type semiconductors, first N-type semiconductors corresponding to (2n−1)-th (n being a positive integer) are connected with the first signal line, and second N-type semiconductors corresponding to 2n-th are connected with the second signal line, and parasitic capacitances of the first and second PN junctions are varied by adjusting the control voltage.