title: Two-electrode low supply voltage electrocardiogram signal amplifier.
abstract: Portable biomedical instrumentation has become an important part of diagnostic and treatment instrumentation, including telemedicine applications. Low-voltage and low-power design tendencies prevail. Modern battery cell voltages in the range of 3-3.6 V require appropriate circuit solutions. A two-electrode biopotential amplifier design is presented, with a high common-mode rejection ratio (CMRR), high input voltage tolerance and standard first-order high-pass characteristic. Most of these features are due to a high-gain first stage design. The circuit makes use of passive components of popular values and tolerances. Powered by a single 3 V source, the amplifier tolerates +/- 1 V common mode voltage, +/- 50 microA common mode current and 2 V input DC voltage, and its worst-case CMRR is 60 dB. The amplifier is intended for use in various applications, such as Holter-type monitors, defibrillators, ECG monitors, biotelemetry devices etc.
authors.affiliation: Centre of Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria. ikdas@argo.bas.bg
authors.forename: D
authors.initials: D
authors.lastname: Dobrev
mesh_terms: D000669:Amplifiers, Electronic; D004562:Electrocardiography / Q000295:instrumentation*; D004582:Electronics, Medical / Q000295:instrumentation; D004867:Equipment Design; D006801:Humans; D017216:Telemedicine / Q000295:instrumentation