I have a passion for developing biomedical devices, particularly in low-resourced settings where costs for these devices are very high, and access limited. I plan on working on the CMOS Instrumentation Amplifier through an open-source process, particularly because several skills can be developed in taping out a useful circuit, but this also helps set a precedent for future IC designs that can be used in countries like Somalia where I hail from.
Continuous monitoring of biopotential signals is necessary for recording neural activity through electroneurography (ENG). However, these signals are low-frequency and low-amplitude, requiring not only strong amplification, but high common-mode rejection ratios (CMRR) and rejection of dc electrode offsets. One such amplifier topology is a CMOS Current-Feedback Instrumentation Amplifier that utilizes current-feedback as will be explored in this project. In this topology, the gain can be set accurately through a resistor ratio, while the CMRR is not dependent on resistor matching, providing an attractive low-area, high-fidelity device for biomedical applications.
opamp