| 摘要 |
PURPOSE:To prevent the radiation of electromagnetic waves from a high-frequency electric signal generating circuit by a method wherein a conductive layer is mounted to the high-frequency electric signal generating circuit through an insulating layer, and the conductive layer is held at predetermined potential. CONSTITUTION:A charge transfer type delay wire 3 and a pulse generating circuit section 4 driving the delay wire 3 are mounted onto a semiconductor substrate 2. Pad terminals 9-16 are set up in order to connect other semiconductor elements 5-8 disposed onto the substrate 2 by bonding wires. The conductive layer 17 for preventing the radiation of electromagnetic waves is formed through the insulating layer so as to cover the delay wire 3 and the circuit section 4. The conductive layer 17 is connected to reference potential through pad terminals 18, 19. According to such constitution, electromagnetic waves generated at the circuit section 4 and the delay wire 3 damp by the conductive layer 17, and the amount of radiation to the outside is reduced extremely. |
