On chip testing data converters using static parameters

In this paper, built-in self-test (BIST) approach has been applied to test digital-to-analog (D/A) and analog-to-digital (A/D) converters. Offset, gain, integral nonlinearity (INL), and differential nonlinearity (DNL) errors and monotonicity are tested without using mixed-made or logic test equipment. An offline calibrating technique has been used to insure the accuracy of BIST circuitry and to reduce area overhead by avoiding the use of high quality analog blocks. The proposed BIST structure presents a compromise between test cost, area overhead, and test time. By a minor modification the test structure would be able to localize the fail situation. The same approach may be used to construct a fast law cost off-chip D/A converter tester, The BIST circuitry has been designed and evaluated using complementary metal-oxide-semiconductor (CMOS) 1.2 mu m technology.