2019 26th IEEE International Conference on Electronics, Circuits and Systems (ICECS) | 2019
Area-Efficient Low-Power Bandpass Gm-C Filter for Epileptic Seizure Detection in 130nm CMOS
Abstract
A low-power 6th-order Butterworth bandpass filter has been designed for the front-end of an integrated neural recording system. The passband has been set to 250-500Hz to allow recording the fast ripple (FR) associated with epileptic seizure onset and filter out all other undesired components of the neural signals. The filter is composed of 3 Gm-C biquad stages. Low-power operation is achieved by biasing the MOS devices in the sub-threshold region, and using a dual power supply of ±0.5V. The filter achieves a power consumption of $3.8\\ \\boldsymbol{\\mu}\\mathbf{W}$ with a load of 1pF, a bandwidth of 243Hz, and the estimated size of the layout is only 0.1mm2.