In this document we will briefly describe a mixed analog-digital integrated circuit to be employed in a Central Exchange Switching System. This generates a proper shaped telephone metering pulse, according to the actual international standards, and sends it to eight subscribers. It has been designed with a cell-based approach and implemented with a 3 pm double poly single metal CMOS technology. The 8Wo of the circuit uses digital and analog cells, while 20% has been specifically designed down to a transistor level. In order to reduce the power consumption two different supplies was used.
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