Abstract

This paper presents a low-voltage low-power current feedback operational amplifier using bulk driven class AB subthreshold current mirror OTA followed by second generation CCII+ cell having wide input common mode range and an output buffer. The CCII+ cell uses two conventional CMOS inverters connected at the output of the OTA. This OTA circuit permits closely rail-to-rail input common mode range, high output current drive capability with low dual power supply of ± 0.25 V. This CFOA cell produces low input referred noise of 0.8 µV/sqrt Hz, dissipates ultra-low power of 485.3 nW and is suitable of low-frequency applications, such as bio-signal processing. This CFOA cells are utilized to design a SIMO type voltage mode biquadratic filter and current mode instrumentation amplifier to validate its workability. The circuit is simulated using tanner EDA tool in 180 nm n-tub CMOS process technology with low bias current of 20 nA.