Digital signal isolator

Abstract

The invention provides a digital signal isolator comprising a coding unit, a CMOS micro voltage transformer unit group and a decoding unit, wherein the coding unit is used for subjecting input signalsto edge detection, edge information of filtered and shaped signals can be extracted from the input signals, the extracted edge information is converted into coded pulse signals, the CMOS micro voltage transformer unit group is used for coupled transmission of the coded pulse signals, the CMOS micro voltage transformer unit group comprises at least two cascade cascaded CMOS micro voltage transformer units that are connected with each other via bonding wires, one end of a first CMOS micro voltage transformer unit in the CMOS micro voltage transformer unit group is connected with an output portof the coding unit, one end of a last CMOS micro voltage transformer unit is connected with an input port of the decoding unit, and the decoding unit is used for decoding coupled signals. Via application of the digital signal isolator, functions of a digital isolator can be fulfilled while technological difficulty and manufacture costs can be lowered.

Description

technical field [0001] The invention relates to the technical field of digital signal transmission, in particular to a digital signal isolator based on a CMOS microtransformer. Background technique [0002] Digital signal isolators are mainly used for the transmission of digital signals. Digital isolation technology is often used in field buses in industrial network environments, military electronic systems, aerospace electronic equipment, and medical equipment, especially in some harsh application environments. One of the first reasons for using an isolator is to eliminate noise; another important reason is to protect devices (or people) from high voltage hazards. For a long time, optocoupler has been the first choice for the isolation circuit selection scheme. It is widely used, the whole circuit is very mature, and the cost is very low. However, with the continuous improvement of modern system integration and the increasingly strict working environment, the insurmountabl...

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Problems solved by technology

[0004] However, the above-mentioned microtransformer must be manufactured with a special process, and in order to achieve a higher withstand voltage, it is necessary to use a polyimide material of more than 10um as the isolation medium between the primary coils, so the process difficulty and manufacturing cost are very high.

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