A Low Noise OPAMP with Chopper Stabilization for Biomedical Applications

  B.Sai Abhinav,  Ambati Suresh,  Kumaravel.S

Operational Amplifier plays a key role in Analog circuits of which is the key area in biomedical application. In the field of Bio Medicine the bio potential signals are one of the basic signals that are monitored. A CMOS (Complementary Metal oxide Semiconductor) design comprising fully differential Operational Amplifier circuit decreases the noise present in the measured input bio potential signals. Bio potential signals are low frequency, low amplitude range signals. Hence the noise present in the Operational Amplifier is mostly flicker noise. At lower frequencies flicker noise dominates other component frequencies, therefore flicker frequency filtering forms the crux in noise removal. The fully differential Operational Amplifier is drawn from single differential Operational Amplifier to get low noise levels. The innovation of our design lies in the modified architecture of Operational Amplifier. The circuit with fully differential Operational Amplifier helps in scaling down of noise to 0.3nv/√Hz with a corner frequency of 10 Hz and 1v of power supply which performs better than the Fully Differential Operational Amplifier. The Modified design in this paper has been implemented in Cadence 90nm technology.

Keywords- flicker noise, Chopper, corner frequency.

Unique Identification Number - IJEDR1502089
Page Number(s) - 475-481
Pubished in - Volume 3 | Issue 2 | May 2015
DOI (Digital Object Identifier) -   
Publisher - IJEDR (ISSN - 2321-9939)

  B.Sai Abhinav,  Ambati Suresh,  Kumaravel.S,   "A Low Noise OPAMP with Chopper Stabilization for Biomedical Applications", International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.3, Issue 2, pp.475-481, May 2015, Available at :http://www.ijedr.org/papers/IJEDR1502089.pdf