DC testing of switched capacitor based delta sigma converters

Switched capacitor Delta Sigma analog to digital converters are basic parts in mixed signal system; its testing is of great importance. The paper discusses a low-cost test for the conventional, as well as low power, first order switched capacitor Delta Sigma ADC. The test detects only the catastrophic faults assuming one fault at a time. The simulation results prove that the minimum test set required to detect all the faults contains only two analog values. The simulation tool used is the ELDO simulator provided by Mentor Graphics Corp.