Patent ID: 7675397

Claim:
A transformer, comprising: a multilayer board; at least one input conductive line formed on the multilayer board, defining a loop that extends around an inner area, and having two ends connected to input terminals of a positive signal and a negative signal, respectively; an output conductive line formed adjacent to the at least one input conductive line to form an electromagnetic coupling with the at least one input conductive line, said output conductive line having one end connected to an output terminal and another end connected to a ground; a power supply pad directly formed on the at least one input conductive line; and a harmonics remover formed between the one end and the another end of the output conductive line to remove harmonics components of a signal outputted from the output conductive line, said harmonics remover being formed in the inner area surrounded by the loop defined by the at least one input conductive line; wherein each of the at least one input conductive line and the output conductive line comprises different parts which are formed on different layers of the multilayer board, respectively, and which are connected to each other via a via hole; and the output conductive line is free of direct electrical connection to the at least one input conductive line.