An inductor includes a plurality of first conductive lines, a plurality of second conductive lines and a plurality of contacts. Each of the first conductive lines is spaced apart from one another. Each of the second conductive lines is spaced apart from one another, and each of the second conductive lines crosses over each of the first conductive lines. Each of the contacts electrically interconnects one of the first conductive lines and one of the second conductive lines. These contacts are arranged in a way such that at least parts of the first conductive lines and at least parts of the second conductive lines form an electric current path serving as an inductor.