A modified CMOS differential operational transresistance amplifier (OTRA)

Abstract

A modified CMOS realization of the differential operational transresistance amplifier (OTRA) is presented. A fair comparison with Mostafa and Soliman OTRA [Mostafa H, Soliman A. A modified CMOS realization of the operational transresistance amplifier. Frequenz 2006;60:70–6] shows that the modified differential OTRA provides better performance in most parameters. The OTRA is suitable for analog VLSI applications since it does not suffer from constant gain bandwidth product. Hence, it can exhibit wide bandwidth at high gain values. Moreover, an OTRA-based variable gain amplifier (VGA) is also introduced.