Common Mode Voltage Removal Using New Balancing Technique

Many industrial and biomedical applications use instrumentation amplifier to condition small signals (in the range of microvolts) in presence of large common mode voltage (CMV) and offset voltage. It is important to have the signal as clean as possible to detect essential information from the signal of interest. Power-line interference also appears as common mode signal. Filtering removal of time-varying power-line signal of interest is a major challenging problem in high resolution biomedical measurement systems. Here, CMV reduction methods are reviewed and a new method of CMV removal using balancing technique is described in detail. This new method improves total common mode rejection ratio (CMRR) of system from 10 value. Experimental results show superior results than existing system and can be used to remove