Yaqub Al-Hussain Mahnashi,Hussain Abdullah Alzaher
申请号：
US13926942
公开号：
US08866542B1
申请日:
2013.06.25
申请国别(地区):
US
年份:
2014
代理人:
摘要：
The low frequency filter for biomedical applications scales down the pole frequency while accomplishing a 5-bit reduction in the cut off frequency. This is made possible through adding a passive resistor in the forward path of the op-amp-based integrator, introducing a difference term of the pole frequency. Moreover, the filter topology is modified to avoid changing the quality factor. An exemplary second-order low pass filter is designed and simulated. Simulation results show that the pole frequency is scaled down from 1.43 MHz to 4.97 kHz, while maintaining tuning of 30% around the nominal value by controlling only one resistor.
