Title :
A 1.5V, 300nA, 7th-order bandpass filter for sensing intra-cardiac signals in implantable biomedical devices
Author_Institution :
Micron Technol., Inc., Pasadena, CA
Abstract :
Sensing filter for cardiac pacemaker or defibrillator mixed-signal integrated circuits is the only part of the system which is on continuously and is monitoring the heart activities. Thus, a low current consumption is a very critical attribute for this circuit. This paper presents a 7th-order customized bandpass filter that can operate using a single implantable lithium-iodine battery at the end of its life, which is 1.5V. The filter is capable of conditioning human heart activity signals from 50muV to 10mV. It operates with 1 kHz sampling frequency consuming less than 0.5muW. The filter is designed in a very typical 0.5mum, double-poly capacitor, N-well CMOS process with 0.7V-0.8V threshold voltages
Keywords :
CMOS integrated circuits; band-pass filters; cardiology; defibrillators; medical signal detection; mixed analogue-digital integrated circuits; pacemakers; prosthetic power supplies; 0.05 to 10 mV; 0.5 micron; 0.7 to 0.8 V; 1 kHz; 1.5 V; 300 nA; CMOS process; bandpass filter; cardiac pacemaker; defibrillator; human heart activity signals; implantable biomedical devices; implantable lithium-iodine battery; intra-cardiac signal sensing; mixed-signal integrated circuits; sensing filter; Band pass filters; Batteries; Biomedical monitoring; Frequency; Heart; Humans; Implantable biomedical devices; Mixed analog digital integrated circuits; Pacemakers; Signal sampling;
Conference_Titel :
Circuits and Systems, 2005. 48th Midwest Symposium on
Conference_Location :
Covington, KY
Print_ISBN :
0-7803-9197-7
DOI :
10.1109/MWSCAS.2005.1594400
