Design and Reliability Assessment of ABCD to 7- Segment Converter with Emphasis on Noise Margins

The design and performance evaluation of a BCD-to-7-segment code converter circuit is presented with particular emphasis on its noise margin characteristics. Noise margin is a critical parameter that determines the reliability of digital circuits by quantifying their tolerance to electrical disturbances. To determine the Noise Margin High (NMH) and Noise Margin Low (NML) values for each of the seven output segments, the converter circuit was developed and examined in this study. The results show that NMH values range between 0.6526–0.8635 V, while NML values fall within 0.7785–0.8301 V. These findings confirm that all outputs exhibit strong immunity to both high- and low-level noise, with only minor variations across segments due to differences in their underlying Boolean logic functions. Notably, segment a demonstrated the lowest NMH, while segment e exhibited the highest NML, highlighting the balanced yet distinct behavior of individual outputs. The overall uniformity of the results indicates stable switching characteristics across the circuit, thereby ensuring dependable performance in practical display applications. The study concludes that the proposed BCD to 7-segment code converter achieves robust noise tolerance and is well-suited for reliable implementation in digital systems operating under noisy environments.