Iranian Journal of Biomedical Engineering (IJBME)
نوع مقاله : مقاله کامل پژوهشی
نویسندگان
مشهد، بلوار جلال آل احمد، جلال آل احمد ۶۴، دانشگاه سجاد، دانشکده برق و مهندسی پزشکی، آزمایشگاه مدار مجتمع
کلیدواژهها
موضوعات
عنوان مقاله English
نویسندگان English
Noise reduction and DC offset cancellation are two of the main challenges in the design of biopotential recording amplifiers. One common method for reducing operational amplifier flicker noise and offset is to use the chopper - stabilized technique. Switch charge injection, long settling time, and ripple are the main drawbacks of using chopper amplifiers. The proposed circuit uses capacitive coupling to eliminate the ripple that the offset of the chopping amplifier induces. Also, a feedback circuit is used to prevent the saturation of the chopping amplifier, while a rail - to - rail input common - mode range is guaranteed. The proposed circuit is suitable for low - power applications such as wearable medical instruments. The proposed circuit is designed in a 180 nm CMOS technology with a 1.8 V supply voltage. Simulation results show a power consumption of 23 µW and a noise voltage spectral density of 44.5 nV/√Hz.
کلیدواژهها English
