The trend toward lower power supply voltageshas recently inspired the design of integrated single-supply high-frequency amplifiers. The greatestuse of these circuits is in passing video signals,although there are many other applications.Unity-gain bandwidths of the new offerings arein the 90 MHz±160 MHz range.The earliest single-supply IC amplifier is theLM324, developed circa 1974. This is a 1 MHzop-amp that set the definition of a single-supplycircuit: