Monolithic 2.5kV RMS, 1.8V–3.3V dual-channel 640Mbps digital isolator in 0.5μm SOS

Abstract

In this paper we describe a dual-channel, monolithic, capacitive digital isolator on 0.5μm SOS, with a measured single-channel maximum speed of 640Mbps at 3.3V supply -more than 2X better than all previously reported commercial and academic literature. We report 1.8V-compatible operation for the first time, achieving a top speed of 260Mbps; which exceeds the 3.3V performance of all previously reported designs. Current draw (85μA/Mbps at 3.3V) and galvanic isolation level (2.5kV RMS) are competitive with commercial offerings.