We observe rich phenomena of two-level random telegraph noise (RTN) from a commercial bulk 28-nm p-MOSFET (PMOS) near threshold at 14 K, where a Coulomb blockade (CB) hump arises from a quantum dot (QD) formed in the channel. Minimum RTN is observed at the CB hump where the high-current RTN level dramatically switches to the low-current level. The gate-voltage dependence of the RTN amplitude and power spectral density match well with the transconductance from the DC transfer curve in the CB hump region. Our work unequivocally captures these QD transport signatures in both current and noise, revealing quantum confinement effects in commercial short-channel PMOS even at 14 K, over 100 times higher than the typical dilution refrigerator temperatures of QD experiments (<100 mK). We envision that our reported RTN characteristics rooted from the QD and a defect trap would be more prominent for smaller technology nodes, where the quantum effect should be carefully examined in cryogenic CMOS circuit designs.
High speed and high-temperature operation capabilities are desirable features of integrated circuits. Due to their innate electrical and physical properties, silicon devices face significant hurdles at elevated temperatures, while silicon carbide devices perform remarkably well in such environments. This paper studies the performance of various high-speed 4H-SiC bipolar logic families including transistor-transistor logic, Schottky transistor-transistor logic, and emitter-coupled logic. All logic circuits have been optimized for high speed and high-temperature operations. Gate delays as low as 2.7 ns at room temperature and less than 5 ns at 500 • C have been achieved without sacrificing fan-out capability and noise margin stability.INDEX TERMS 4H-SiC, bipolar integrated circuits, ECL, high speed, high temperature, logic family, STTL, TTL.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.