Interface Adaptation Design for Extracellular Recordings From Excitable Tissue

For a clear and almost exhaustive perspective on the physiology of living organisms, it is important to use the best method to sample the signal and to process it correctly, without affecting the content of information. Therefore, the method must ensure the best possible sensitivity and selectivity. In this work, a device for processing physiological signals is designed. The main component will be an instrumentation amplifier, whose characteristics meet specific requirements. This is an amplifier suitable for high-quality recording of extracellular signals from muscle and nervous tissue. Its characteristics are related to the fact that it has a gain and bandwidth for the signals of interest, a common mode rejection rate, filtering and low internal noise. The input impedance is high, and the consumption is low are other key features of this device. In addition, the component costs are very low, and the design is very compact. Due to the high input impedance of the amplifier, it adapts very easily to different signals. The final experimental results show the viability of the solution chosen by design.