Soongsil University

Ga Yeon Ko

Chang Kun Park

Mi Lim Lee

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&#x2212;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.

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Ansan-si, South Korea

Ga Yeon Ko