| 摘要 |
PROBLEM TO BE SOLVED: To provide a package structure in which one end of a terminating resistor is joined to a conductor in a package and the wiring pattern of the package makes a microstrip line structure and to form the terminating resistor at an inexpensive price and with high accuracy. SOLUTION: In a metal board having four-layer structure comprising a metal plate, an insulating layer 5 formed on the metal plate, a resistor layer 3 of an adhesive layer formed on the insulating layer 5 and a metal foil formed on the resistor layer 3, the metal foil is formed in a wiring pattern 4 and an island 2 mounted with a semiconductor chip. A resistor made of the resistor layer 3 is formed between the island 2 and the wiring pattern 4 at predetermined positions. The metal plate is divided into a ground plane 6 and a part 7 joined to the outside terminal. The island 2 is joined to the ground plane 6 by a through hole 1 and becomes an earth potential and the wiring pattern 4 is joined to the part 7 joined to the outside terminal by the through hole 1. |
