A comprehensive model for power line interference in biopotential measurements
Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are quite effective in reducing power-line interference but do not completely eliminate...
| Authors: | , |
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| Format: | article |
| Publication Date: | 2000 |
| Country: | España |
| Institution: | Universitat Politècnica de Catalunya (UPC) |
| Repository: | UPCommons. Portal del coneixement obert de la UPC |
| Language: | English |
| OAI Identifier: | oai:upcommons.upc.edu:2117/1289 |
| Online Access: | https://hdl.handle.net/2117/1289 |
| Access Level: | Open access |
| Keyword: | Amplifiers (Electronics) Medical electronics Electrodes Electric interference Amplifier Biomedical measurements Interference Shielding Amplificadors (Electrònica) Biomedicina Elèctrodes Interferència elèctrica Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica |
| Summary: | Power line interference is a major problem in high-resolution biopotential measurements. Because interference coupling is mostly capacitive, shielding electrode leads and a high common-mode rejection ratio (CMRR) are quite effective in reducing power-line interference but do not completely eliminate it. We propose a model that includes both interference external to the measuring system and interference coming from its internal power supply. Moreover, the model considers interference directly coupled to the measuring electrodes, because, as opposed to connecting leads, electrodes are not usually shielded. Experimental results confirm that reducing interference coupled through electrodes yields a negligible interference. The proposed model can be applied to other differential measurement systems, particulary those involving electrodes or sensors placed far apart. |
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