Patent ID: 9548090
Date: 2017-01-17
CPC Classifications: G11C

Claim:
1. An adjustment method of a signal level in a semiconductor device including a memory macro with a function switching the signal level of a word line, the adjustment method of the signal level comprising: measuring, by an inspection device configured to adjust the signal level in the semiconductor device, characteristics of each transistor in the semiconductor device including a transistor of a memory cell by using a first monitoring circuit, the memory cell being disposed at an intersection part between the word line and a bit line in the memory macro, and the first monitoring circuit including measurement circuits by kinds of transistors in the semiconductor device; determining, by the inspection device, a power supply voltage being supplied to the semiconductor device based on the measured characteristics of the transistor; measuring, by the inspection device, a data read-out speed of the memory cell, under the determined power supply voltage supplied, while changing the signal level of the word line by using a second monitoring circuit including the memory cell; comparing, by the inspection device, the measured data read-out speed of the memory cell and a specification range of the memory cell being found in advance; and determining, by the inspection device, the signal level of the word line in accordance with a comparison result in the comparing.