| 摘要 |
An offset cancellation device for measuring a biological signal is provided. According to the present invention, the offset cancellation device comprises: an input part that receives the biological signal including at least one input capacitor (C_in); an amplification part in which a first offset application part, a first chopper, a second offset application part, an AMP and a second chopper are connected in consecutive order to amplify and transmit the biological signal; a first feedback part where a coupling is engaged between the input part and the first offset application part and also engaged to the rear end part of the second chopper, this part is used to offset the ripple voltage generated by the first chopper through feedback of the output signal from the amplification part; and a second feedback part where a coupling is engaged between the first chopper and the second offset application part and also engaged to the rear end part of the second chopper, this part is used to offset the ripple voltage generated by the second chopper through feedback of the output signal of the amplification part. |
