A front-end for sensing the stimulation and response of auditory nerve cells

摘要: At the moment, about 30 million people worldwide are suffering from hearing loss. Most helped with a simple aid that just amplifies sounds coming to ear. However, if loss is too severe, these aids will not help. More than 100.000 need more complex device in order let them hear again. A cochlear implant such and partially implanted inside human body. Today’s implants able as normal hearing. The main cause can be found stimulation accuracy of auditory nerve fibres. To improve this accuracy, research should performed algorithms, increase amount electrodes focus field electrodes. Researchers now reached limitations existing neural response readout systems needed for reading out evoked compound action potential their research. These urge new system having dynamic range 126dB, small, power efficient, has noise levels under 10µV handle input signals exceeding supply voltage. read 256 implemented MEMS implant. Existing techniques do offer solutions meet above specifications. An overall design proposed based on compensation containing an system, multiplexer, circuit, amplifier analog digital converter (ADC). Because big one thesis, only handled. voltage being compact, have high low contribution. technique additive instantaneous companding record potentials stimulated proposed. Three alternative circuit implementations proposed, two domain charge implementation. designed AMIS I3T25 (high voltage) CMOS technology. implementation very promising using 70 components, bandwidth 10kHz, level 1.1pV. It capable which bigger while signal information preserved. For checking correct working reconstruction performed. In addition, never reported before literature.