Low noise operational amplifier design with current driving bulk in 0.25/spl mu/m CMOS technology

This paper discusses the effect of substrate biasing on equivalent input referred voltage noise E/sub n/, and presents a low noise operational amplifier design with current driving bulk technology. The operational amplifier with reversed substrate biasing by current driving bulk technology is realized in TSMC 0.25/spl mu/m CMOS process, and achieves better noise performance. Simulated performance is that the operational amplifier can obtain equivalent input referred voltage noise E/sub n/ = 2.91 /sub /spl mu/V//spl radic/Hz/ @ 1 Hz, E/sub n/ = 3.38 /sub /spl mu/V//spl radic/Hz/ @ 1 MHz GBW product 280.5 MHz, DC gain 16dB, total harmonic distortion (THD) -76dB@50kHz. Power consumption is 2.35mW under a 2.5V power supply.