RAM Tester Calibration Check
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
In any testing process, in order to obtain a meaningful measurement, it is critical to make sure that the tester itself is calibrated properly. For a fast operation device under test (DUT), such as a 16K dynamic RAM (random-access memory), the timing of the interfacing signal to the DUT from the tester is crucial. A marginal setup could give an intermediate working situation that misleads one to think the calibration has been properly done; hence, many hours of testing may be invested before the error in calibration is detected. A simple, fast method to check the tuned circuit in the tester utilizes a known good test reference module and test patterns that are selected to produce a predetermined number of error indications.