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Optocoupler circuit

An optical coupler and circuit technology, applied in the direction of circuit, optical waveguide coupling, electrical components, etc., can solve problems such as signal delay, unsuitable application, and complexity

Inactive Publication Date: 2012-08-22
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach may not be suitable for many applications for various reasons
For example, such an arrangement may be prone to undesired signal delays due to the signal having to traverse the path
Additionally, such devices can be complex and interfacing the transmitter and receiver via an optocoupler has the associated additional complexity / cost
[0004] Therefore, implementing circuits that require electrical and / or galvanic isolation remains challenging

Method used

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Embodiment Construction

[0018] While the invention is susceptible to various modifications and alternative forms, details thereof are shown and described in detail by way of example in the drawings. It should be understood, however, that the intention is not to limit the invention to the particular embodiments described. On the contrary, the intention of these descriptions is to cover all modifications, equivalents, and alternatives falling within the scope of the invention, including aspects defined in the claims. In addition, the term "example" used throughout the text is for illustration rather than limitation.

[0019] The present invention is applicable to many different types of circuits, devices and apparatuses incorporating optocouplers. While the invention is not necessarily limited by the description, aspects of the invention can be appreciated through a number of relevant examples.

[0020] According to example embodiments, optocouplers may be integrated onto a single integrated circuit ...

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PUM

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Abstract

The present invention relates to an optocoupler device facilitates on-chip galvanic isolation. In accordance with various example embodiments, an optocoupler circuit includes a silicon-on-insulator substrate having a silicon layer on a buried insulator layer, a silicon-based light-emitting diode (LED) having a silicon p-n junction in the silicon layer, and a silicon-based photodetector in the silicon layer. The LED and photodetector are respectively connected to galvanically isolated circuits in the silicon layer. A local oxidation of silicon (LOCOS) isolation material and the buried insulator layer galvanically isolate the first circuit from the second circuit to prevent charge carriers from moving between the first and second circuits. The LED and photodetector communicate optically to pass signals between the galvanically isolated circuits.

Description

technical field [0001] Aspects of the invention relate to electronic circuits, and more particularly to monolithically integrated optocoupler circuits. Background technique [0002] Various circuit devices use isolation for a variety of purposes. One example type of circuit isolation is galvanic isolation, which allows information to be exchanged between two parts of a circuit, or two circuits, without actual charge carrier flow between them. Galvanic isolation has been used in a variety of circuits, including circuits that have different parts operating at significantly different voltages, to protect lower voltage parts, avoid undesired ground loop bias, and achieve other desirable characteristics. [0003] One type of galvanic isolation circuit is an optocoupler circuit or chip. Typically, an optocoupler has a light-emitting photodiode and a photodetector separated by a transparent dielectric layer. To achieve galvanic isolation using this method, the optocoupler circui...

Claims

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Application Information

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IPC IPC(8): H01L27/02H01L21/82G02B6/42
CPCH01L27/15H01L31/173H01L33/343
Inventor 杜桑·戈卢保维克格哈德·库普斯托尼·范胡克罗布·范达伦
Owner NXP BV