Lowest power optimal dynamic range continuous time MOSFET-C filter in submicron CMOS technology compared with experimental measurement results

The Fully differential operational amplifier (op-amp) schematics are compared in terms of specifications such as unity gain frequency, current consumption. After choose LCR prototype, the proposed op-amp is used in 3^rd order Butterworth response MOSFET-C lowpass filter. Simulation results using 0.35 um from TSMC corporation indicated that the proposed op-amp has an ability to have output signal swing from rail-rail (which means input output swings from positive to negative dc supply without distortion. MOSFET-C which used the proposed op-amp should have highest linearity if it is designed optimally. Figure of merit of fully differential op-amp is also proposed, this special specification of op-amp indicated that the proposed fully differential op-amp consumed least current at the same unity gain frequency compared with conventional schematics at least in simulation results. Experimental results from CMOS array of ALD1103, which is connected as fully differential op-amp, are used to compared with simulation results to supported the claimed.