Communication devices and associated methods for reducing IQ impairments in signals used by the communication devices are described. In one approach, an enhanced-surface-area electrically conductive layer for such capacitors is formed by processing a ruthenium oxide layer at high temperature at or above 500 C. If it is determined that the call module making the call to the critical OS function was not called by a call instruction, the method further includes taking protective action to protect a computer system. The cartridge includes a cartridge body with a writing material outlet hole, and can include a lid with a lid hole and a bumper portion.