Effect of Semiconductor Devices on the Power Dissipation of Telephone Communications Systems

Sixty percent of telephone communication equipment power is consumed by the line circuits, 20% by the power supplies and 20% by the common control circuits. In general, line-circuit dissipation is decreasing as more Large Scale Integration (LSI) is introduced, due to special power saving circuits. Powering down under microprocessor control, derating of power devices and use of VMOS will reduce power supply losses. The common control has benefited the most from the LSI explosion. Due to increased cost of energy, low-power technologies (CMOS) are now more cost effective than more conventional ones (NMOS).