TY - GEN AU - Gázquez Parra, José Antonio AU - Fernández Ros, Manuel AU - Novas Castellano, Nuria AU - García Salvador, Rosa María PY - 2015 SN - 0018-9456 UR - http://hdl.handle.net/10835/15753 AB - Schumann resonances are very weak natural electromagnetic signals produced in the earth–ionosphere cavity located in the extremely low frequency (ELF) band (7–60 Hz), and the sensors that measure them produce amplitudes of few microvolts. Strong... LA - en PB - IEEE KW - Extremely low frequency (ELF) band KW - instrumentation amplifier (IA) KW - magnetic sensor KW - measurement KW - noise KW - Schumann resonance TI - Techniques for Schumann Resonance Measurements: A Comparison of Four Amplifiers With a Noise Floor Estimate DO - 10.1109/TIM.2015.2420376 ER -