关键词: 片上变压器, 四通道隔离器, 编解码

Abstract: The On-chip transformer is made of inductance coil,basing on MEMS technology.The traditional isolator uses the discrete component.As the result,it has some disadvantages,such as large volume and high power consumption.It also can't be integrated in the same shell.The on-chip transformer can get rid of disadvantagesoftraditional isolation devices.Its performance for high frequencysignal couplingis much better,also has low power consumption and can be integrated.So it has obvious advantage in the application and a broad market prospect.Based on the on-chip transformer,we design a four-channel digital isolator,which can transmit 90 Mbps digital signal,using SMIC company0.18 μm BCD process as the flow sheet and success.The chipworks for 3～5 V,workingtemperature range for-40℃to+125℃,achieving40 ns transmission delay,data transferrate reachingDC-90Mbps.

Key words: on-chiptransformer, four-channelisolator, encoding and decoding