ELECTROMAGNETIC WAVE GENERATION PREVENTING CIRCUIT

摘要

PURPOSE: An electromagnetic wave generation preventing circuit is provide to change the signal transmission path so as to prevent the electromagnetic wave generation generated by the digital components mounted on the circuit board together with the analog components. CONSTITUTION: An electromagnetic wave generation preventing circuit includes a digital circuit block(25) incorporating thereon digital components operated in response to the digital signal, an analog circuit block(26) incorporating thereon analog components operated in response to the analog signal, a ground block(24) and a bridge(33). The ground block(24) includes a ground gap(27) in such a way that the ground of the digital circuit block(25) is separated from that of the analog circuit block(26) and formed the bottom layer of the digital circuit block(25) and the analog circuit block(26). A high speed signal line(30), formed in the ground gap(27) of the ground block(25), passes through the bridge(33) to connect the digital circuit block(25) with the analog circuit block(26).