Isolation capacitor and isolation circuit

Abstract

The invention discloses an isolation capacitor and an isolation circuit. The isolation capacitor comprises a substrate, a dielectric layer positioned on the substrate and electrode wires positioned onthe dielectric layer; and the electrode wires comprise a first electrode wire and a second electrode wire which are arranged at an interval, and the isolation capacitor is electrically connected withan external chip or system through the first electrode wire and / or the second electrode wire so as to realize electrical isolation. According to the isolation capacitor, the dielectric layer is arranged on the substrate, and the two stages are arranged on the surface of the dielectric layer, so that the parasitic capacitance between the polar plates is reduced, the attenuation in the AC signal transmission process is reduced, and back-to-back enhanced isolation can be realized; and the magnitude of the isolation voltage can be achieved by changing the distance between the two electrode wires,the preparation process does not need to be changed, and the process cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of isolation circuits, and in particular relates to an isolation capacitor and an isolation circuit. Background technique [0002] Isolation capacitors, especially high-voltage capacitive isolation circuits, are increasingly used in signal transmission between chips or systems in different voltage domains. It can provide electrical isolation of up to several thousand volts between two or more chips or systems. Realize the "ground" isolation between different voltage domains, and improve the reliability of chips or systems. [0003] A high-voltage capacitive isolation circuit is usually composed of a transmitter (TX), a receiver (RX) and a high-voltage isolation capacitor. The high-voltage isolation capacitor is used to complete the transmission of AC signals while blocking the passage of DC signals, thereby achieving high-voltage isolation. [0004] High-voltage isolation capacitors are usually realized by ...

AI Technical Summary

Problems solved by technology

[0008] 1. There is a large parasitic capacitance between the upper and lower plates of the capacitor and the substrate, which will cause a relatively large attenuation of the transmitted AC signal;

[0009] 2. To achieve a higher isolation voltage level, the thickness of the dielectric layer must be further increased, which requires adjustment of the manufacturing process, which is difficult to achieve, and the cycle is long and the cost is high

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