LEICI 25638
INSTITUTO DE INVESTIGACIONES EN ELECTRONICA, CONTROL Y PROCESAMIENTO DE SEÑALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Stability Analysis of Bootstrapped Buffers with Application to Two-Wired Biopotential Electrode
Autor/es:
FEDERICO N. GUERRERO; ENRIQUE MARIO SPINELLI; MARCELO ALEJANDRO HABERMAN
Lugar:
Houston
Reunión:
Congreso; 2018 IEEE International Instrumentation & Measurement Technology Conference I2MTC 2018; 2018
Institución organizadora:
IEEE Instrumentation & Measurement Technology Society
Resumen:
In this work, the stability of voltage followers implemented with operational amplifiers featuring power supply bootstrapping is analyzed. Power supply bootstrapping allows increasing the input impedance of an amplifier. However, because it constitutes a positive feedback loop, the circuit can become unstable. The model of the bootstrapped amplifier is determined and a compensation strategy is proposed based on the relation between the common mode and power supply rejection ratios of the operational amplifier, which can be consulted for most commercial devices. Finally, the proposed compensation is experimentally tested implementing it for a two-wired active electrode for biopotential measurement applications.
