Disclosed are composite building boards and associated manufacturing methods. The injection device comprises a housing with at least one first compartment which is set up to receive an injection medium, and at least one second compartment which is spatially separated from the first compartment, both compartments having an injection unit. As such, the mirrored current, resulted from mirroring the charging current on the capacitor to be measured, is used to charge the integral capacitor. During ESD events, the n-well is floated to improve clamping performance.