A /spl plusmn/2.45 V-swing CMOS telescopic operational amplifier

This telescopic opamp offers higher output swing than a conventional telescopic amplifier while maintaining high CMRR and supply rejection (PSRR), and ensuring constant performance parameters. Transistors are deliberately driven deep into the linear region. The output swing is improved by 0.7V from a telescopic amplifier and becomes comparable to a folded cascode amplifier. The reduction of gain and CMRR due to the low output resistance in the linear region is compensated by gain enhancement and replica tail feedback, respectively.