Abstract
A reconfigurable fully differential programmable linear-phase filter is presented in the paper which can be used in portable multichannel electroencephalogram, electrocardiogram, wireless brain-heart monitoring systems used in hospital or home care settings. To reduce the influence of coefficient sensitivity and maintain an undistorted bio-signal, a fifth-order ladder-type Bessel Transconductance-Capacitor (Gm-C) lowpass filter is employed. The filter is designed as part of on-chip self-adjusting noise suppression block and its programmability makes it suitable for different biomedical signals processing. Simulation results show that this low-voltage and low-power filter possesses the HD3 of 50.7dB, dynamic range of 62dB, dc gain of -2.899dB, and power consumption of 30µW. Meanwhile, the designed filter can effectively reduce self-adjusting noise on specific channels and anti-aliasing of the analog-to-digital converter (ADC).
