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.
The circuitry for the audio signal and subaudio signalling processing on the new vehicular unit for Italian Mobile Radio System is described. The overall system was realized with two different kinds of CMOS custom circuits and a few other discrete components. The two chips were designed with the switched capacitor (SC) technique and integrated in a 3u double poly CMOS technology. The system is fed by a 5V single power supply and dissipates about 140 mW.
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