Patent ID: 8937509
Filing Date: 2015-01-20
Classification: A61B,H03F

Abstract:
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.