Patent ID: 8884634

Claim:
A semiconductor module comprising: a substrate; a first wiring having a characteristic impedance Z 0 , disposed on the substrate; an electrode pad connected to the first wiring; a junction having an impedance Z 1 , disposed on the electrode pad; an oscillator to oscillate a pulse wave of a voltage toward the junction via the first wiring, disposed in contact with the first wiring; and a detector to detect an output wave of the pulse wave from the junction, disposed in contact with the first wiring; wherein the characteristic impedance Z 0 and the impedance Z 1 satisfy a following relationship (1),  Z ⁢ ⁢ 0 - Z ⁢ ⁢ 1 Z ⁢ ⁢ 0  ≤ 0.05 . ( 1 )