A low-offset bandgap circuit including a core bandgap circuit and an offset-cancelling circuit is provided. The back light source panel has a panel portion that extends farther than the back side of the liquid crystal display panel to be located beyond the back side in order to provide illumination other than to the back side when the back light source panel illuminates the liquid crystal display panel. The envelope curve detection unit detects a first envelope curve based on the first received signal and a second envelope curve based on the second received signal, respectively. The infusion pump assembly also includes a locking disc at a terminus of the pump barrel. The flange includes at least one bore hole configured to receive a post-tensioning tendon.