Embodiments of detection circuitry are disclosed. A current reduction module can be employed to offset the bias current and to reduce a portion of the bias current from appearing in a subsequent stage to the amplifier in order to mitigate power in the subsequent stage. Further, the gate side wall film consists of an insulating film containing a silicon nitride film and a silicon oxide film and serves to protect the side surface of the gate electrode. The vessel segments are alignable in the respective coupler halves such that a path for fluid flow is formed therebetween upon connection of the coupler halves. The first sensor may be disposed at a fixed displacement from the first illuminator and a second sensor. The method includes a varnish treatment process and application by preheating the stator; adjusting a viscosity of the varnish; dripping the varnish onto a coil end of the stator from radially outside the stator while rotating the preheated stator around a central axis; and hardening the varnish dripped onto the coil end by heating the stator.