7-Bio electric Amplifiers-14-Dec-2018Reference Material I_Bio Amplifiers.pdf

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Bio Amplifiers Biosignals are recorded as potentials, voltages, and electrical field strengths generated by nerves and muscles. The measurements involve voltages at very low levels, typically ranging between 1 μV and 100 mV, with high source impedances and superimposed high level interference signals and noise. The signals need to be amplified to make them compatible with devices such as displays, recorders, or A/D converters for computerized equipment. Amplifiers adequate to measure these signals have to satisfy very specific requirements. They have to provide amplification selective to the physiological signal, reject superimposed noise and interference signals, and guarantee protection from damages through voltage and current surges for both patient and electronic equipment. Amplifiers featuring these specifications are known as bio potential amplifiers Basic Amplifier Requirements The basic requirements that a bio potential amplifier has to satisfy are: The physiological process to be monitored should not be influenced in any way by the amplifier The measured signal should not be distorted • T he amplifier should provide the best possible separation of signal and interferences • T he amplifier has to offer protection of the patient from any hazard of electrical shock • T he amplifier itself has to be protected against damages that might result from high input voltages as they occur during the application of defibrillators or electrosurgical instrumentation A typical configuration for the measurement of bio potentials is shown in Fig.1.13 Three
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