Multi-channel biopotential signal acquisition systems

摘要

A multi-channel biopotential signal acquisition system is disclosed. In the system, a plurality of biopotential channels is corrected for common-mode interference. In one aspect, each biopotential channel includes an electrode for providing a biopotential input signal and an associated amplifier for amplifying the biopotential input signal and providing a biopotential output signal. The output signal is processed in a processor. Each biopotential output signal is passed to a common-mode feedback system, which determines an average common-mode signal and feeds that signal back to each of the amplifiers in each of the biopotential channels to enhance common-mode rejection ratio of the system.

主权项

1. A system for acquiring biopotential signals of a user, the system comprising:
at least two biopotential channels, each channel comprising an electrode configured to detect a biopotential input signal and an amplifier configured to amplify the biopotential input signal to provide an amplified biopotential output signal, at least one of the biopotential channels comprising an active electrode formed by the electrode and the amplifier, each amplifier in each active electrode comprising a chopper-stabilized capacitively-coupled amplifier; a back-end processing circuit configured to process the amplified biopotential output signals; and a common-mode feedback system connected to receive the amplified biopotential output signals to determine an average common-mode signal from the amplified biopotential output signals, the system being further configured to feed the average common-mode signal back to each amplifier to enhance common-mode rejection ratio of the system.