Integrated circuit D-MOS telephone crosspoint array

Double-diffused MOS transistors have desirable properties for use as an analog switch, or crosspoint, in space division telephone switching systems. This paper will cover a 8 × 2 D-MOS crosspoint array in which the analog switches have ON resistance of 12 ohms and OFF capacitance (source-drain) of 0.25 pF. Sixteen 12-ohm switches have been integrated with control circuitry on the same die, while typically maintaining -105 dB isolation and crosstalk.