New CMOS realization of the differential difference operational floating amplifier with wide input voltage range

Abstract

A wide input voltage range differential difference operational floating amplifier is introduced. The proposed realization is based on the cascading connection of a differential difference transconductor (DDT) and a differential input balanced output current op-amp (DIBO). The proposed DDT is based on differential transconductor stage with rail-to-rail differential input voltage swing. The DIBO current op-amp consists of high gain transresistance amplification stage and high CMRR single input balanced output transconductor stage. The new DDOFA block has 74.17 MHz unity gain BW, DC gain of 57 dBmA/V and CMRR of 85.32 dB and rail-to-rail differential input voltage swing using CMOS 0.25 mum technology model.