Galjan, WjatscheslawWjatscheslawGaljanHafkemeyer, Kristian M.Kristian M.HafkemeyerTomasik, Jakob M.Jakob M.TomasikWagner, FabianFabianWagnerKrautschneider, WolfgangWolfgangKrautschneiderSchröder, DietmarDietmarSchröder2024-06-192024-06-192009IEEE EUROCON 2009 : EUROCON '09 ; [international conference devoted to the 150th anniversary of Alexander Popov] ; St. Petersburg, Russia, 18 - 23 May 2009. - Art. no. 516621 (2009)9781424438617https://hdl.handle.net/11420/47925To cover a wide range of biomedical applications, the presented instrumentational amplifier (INA) for acquisition of biomedical signals is adjustable regarding power consumption and noise. In addition, DC-offsets larger than & 500 mV resulting from electrochemical potentials of the electrodes can be compensated by applying a voltage to an additional input. To achieve a high common mode rejection ratio (CMRR) of more than 80 dB, a digitally controlled calibration circuitry has been integrated. The novel concept of calibrating the CMRR in the high resistive feedback loop of an opamp and the DC electrode potential suppression does not require any external components. The INA has been fabricated in a 350 nm CMOS technology. © 2009 IEEE.enCalibrationCMRRDC-OFFSETECGEEGTechnology::621: Applied Physics::621.3: Electrical Engineering, Electronic EngineeringConference Paper10.1109/EURCON.2009.5167621Conference Paper