Ultra-low power comb filter

This paper presents the design of a dynamic threshold voltage MOS transistor (DTMOS) based ultra-low power comb filter to eliminate the power line interference from biomedical signals like ECG and EEG signals. The approach used to design the comb filter successfully demonstrates the application of low power second generation current conveyor (CCII) whose power consumption is as low as 0.214µW. In this approach, a number of inverted band pass filters (IBPFs) of various center frequencies and quality factors have been used. All Inverted Band Pass Filters have been designed using low power CCII and passive components (resistors and capacitors). The DTMOS technique used makes the comb circuit capable of working under a low supply voltage with total power consumption of 7.54µW only. The functionality and effectiveness of the presented design is investigated through PSPICE simulations.