2.3 kVac 100 MHz multi-channel monolithic isolator IC

Abstract

We have developed a multi-channel monolithic isolator IC that can provide 2.3 kVac isolation and 100 MHz signal transmission. This IC uses high voltage on-chip isolator technology using trench isolation with buried oxide on the SOI substrate and 0.4 /spl mu/m CMOS driver and receiver circuits. This technology enables to produce a 4-channel monolithic isolator with an area of 1.5 mm/sup 2/ and a consumption current of 0.5 mA per channel at a frequency of 50 MHz. We have also developed a one-chip modem interface IC that includes the multi-channel isolator and an analog front-end circuit.