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Programmable Gain Amplifiers with DC Suppression and Low Output Offset for Bioelectric Sensors
Laboratory of Electronics and Bioengineering, ETSI de Telecomunicación, Universidad de Valladolid, Campus Miguel Delibes, Paseo Belén, 15. Valladolid 47011, Spain
* Author to whom correspondence should be addressed.
Received: 4 July 2013; in revised form: 17 September 2013 / Accepted: 22 September 2013 / Published: 27 September 2013
Abstract: DC-offset and DC-suppression are key parameters in bioelectric amplifiers. However, specific DC analyses are not often explained. Several factors influence the DC-budget: the programmable gain, the programmable cut-off frequencies for high pass filtering and, the low cut-off values and the capacitor blocking issues involved. A new intermediate stage is proposed to address the DC problem entirely. Two implementations were tested. The stage is composed of a programmable gain amplifier (PGA) with DC-rejection and low output offset. Cut-off frequencies are selectable and values from 0.016 to 31.83 Hz were tested, and the capacitor deblocking is embedded in the design. Hence, this PGA delivers most of the required gain with constant low output offset, notwithstanding the gain or cut-off frequency selected.
Keywords: bioelectric sensors; biomedical electronics; amplifiers; high-pass filters
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MDPI and ACS Style
Carrera, A.; de la Rosa, R.; Alonso, A. Programmable Gain Amplifiers with DC Suppression and Low Output Offset for Bioelectric Sensors. Sensors 2013, 13, 13123-13142.
Carrera A, de la Rosa R, Alonso A. Programmable Gain Amplifiers with DC Suppression and Low Output Offset for Bioelectric Sensors. Sensors. 2013; 13(10):13123-13142.
Carrera, Albano; de la Rosa, Ramón; Alonso, Alonso. 2013. "Programmable Gain Amplifiers with DC Suppression and Low Output Offset for Bioelectric Sensors." Sensors 13, no. 10: 13123-13142.