Skip to main content
. Author manuscript; available in PMC: 2023 Apr 1.
Published in final edited form as: J Clin Monit Comput. 2021 Mar 19;36(2):483–492. doi: 10.1007/s10877-021-00676-2

Figure 1:

Figure 1:

(A) The BIS XP Digital Signal Converter (DSC), which converts between the analog EEG signals measured from the patient’s forehead and a digital transmission stream to the main device. The DSC also provides electrical isolation between the patient and the device.

(B) The DSC internal circuitry, which is constructed in a clamshell fashion with two circuit boards facing each other with three interconnection points between them. When assembled, this circuitry is wrapped in a flexible, conductive sheet which serves as a ground plane to block electrical interference. This sheet is removed in this image for visibility.

(C) Opening the clamshell reveals that the circuitry is divided into a device side comprised primarily of digital circuitry, and a patient side comprised primarily of analog circuitry. Precision amplifiers are notable on the analog patient side for capturing EEG signals.