| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect an operationally unstable differential input circuit having a small operational margin. Ž<P>SOLUTION: In a test mode in which input/output characteristics of a differential input circuit 10 is tested, the test circuit includes varies at least one of signal levels of an inverting input signal INB and a noninverting input signal INT input to the differential input circuit 10, and reduces a difference between the signal levels of the inverting input signal INB and the noninverting input signal INT more than that in a normal operation. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
