Back-to-back isolation circuit

Patent metadata

Field	Value
Publication number	US-11044022-B2
Application number	US-201916287796-A
Country	US
Kind code	B2
Filing date	Feb 27, 2019
Priority date	Aug 29, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

Isolators having a back-to-back configuration for providing electrical isolation between two circuits are described, in which multiple isolators formed on a single, monolithic substrate are connected in series to achieve a higher amount of electrical isolation for a single substrate than for isolators formed on separate substrates connected in series. Discrete dielectric regions positioned between isolator components forming an isolator provide electrical isolation between the isolator components as well as between the isolators formed on the substrate. The back-to-back isolator may provide one or more communication channels for transfer of information and/or power between different circuits.

First claim

The invention claimed is:

1. An integrated back-to-back isolator device comprising:
a substrate;
a first isolator component and a second isolator component positioned over the substrate, wherein the first isolator component is positioned to overlap, at least partially, with the second isolator component;
a third isolator component and a fourth isolator component positioned over the substrate, wherein the third isolator component is positioned to overlap, at least partially, with the fourth isolator component, wherein the second isolator component and the fourth isolator component are floating, and wherein the second isolator component is connected to the fourth isolator component by an electrical conductor;
a first discrete dielectric region positioned between the first isolator component and the second isolator component; and
a second discrete dielectric region positioned between the third isolator component and the fourth isolator component,
wherein the integrated back-to-back isolator device is configured to transfer signals from the first isolator component to the second isolator component, from the second isolator component to the fourth isolator component, and from the fourth isolator component to the third isolator component.

2. The integrated back-to-back isolator device of claim 1 , wherein the first discrete dielectric region includes a first dielectric material and a second dielectric material having a higher permittivity than the first dielectric material.

3. The integrated back-to-back isolator device of claim 2 , wherein the second dielectric material is formed at least partially around a portion of the first dielectric material.

4. The integrated back-to-back isolator device of claim 2 , wherein the second dielectric material is formed between the first isolator component and a portion of the first dielectric material of the first discrete dielectric region.

5. The integrated back-to-back isolator device of claim 2 , wherein the second dielectric material is formed between a portion of the first dielectric material of the first discrete dielectric region and the second discrete dielectric region.

6. The integrated back-to-back isolator device of claim 1 , further comprising dielectric material formed at least partially over the first isolator component and the third isolator component.

7. The integrated back-to-back isolator device of claim 1 , wherein at least one gap is between the first isolator component and the third isolator component.

8. The integrated back-to-back isolator device of claim 1 , wherein the first isolator component is electrically isolated from the third isolator component, and the first isolator component is configured to operate at a first voltage and the third isolator component is configured to operate at a second voltage different than the first voltage.

9. The integrated back-to-back isolator device of claim 1 , wherein the second isolator component and the fourth isolator component are both electrically isolated from the substrate.

10. The integrated back-to-back isolator device of claim 9 , wherein the integrated back-to-back isolator device includes a first transformer and a second transformer, the second isolator component is a first coil of the first transformer and the fourth isolator component is a first coil of the second transformer, and the first coil of the first transformer has an inner terminal connected to an inner terminal of the first coil of the second transformer, and the first coil of the first transformer has an outer terminal connected to an outer terminal of the first coil of the second transformer.

11. A system comprising:
a back-to-back isolator comprising:
a substrate;
a first isolator component and a second isolator component positioned over the substrate, wherein the first isolator component is positioned to electromagnetically couple with the second isolator component;
a third isolator component and a fourth isolator component positioned over the substrate, wherein the third isolator component is positioned to electromagnetically couple with the fourth isolator component, wherein the second isolator component and the fourth isolator component are floating, and wherein the second isolator component is connected to the fourth isolator component by an electrical conductor;
a first dielectric region positioned between the first isolator component and the second isolator component; and
a second dielectric region positioned between the third isolator component and the fourth isolator component, wherein the first dielectric region and the second dielectric region are separate regions of dielectric material,
wherein the back-to-back isolator is configured to transfer signals from the first isolator component to the second isolator component, from the second isolator component to the fourth isolator component, and from the fourth isolator component to the third isolator component;

at least one first circuit coupled to the first isolator component and configured to operate in a first voltage domain; and
at least one second circuit coupled to the third isolator component and configured to operate in a second voltage domain different than the first voltage domain.

12. The system of claim 11 , wherein the first dielectric region includes a first dielectric material and a second dielectric material having a higher permittivity than the first dielectric material.

13. The system of claim 12 , wherein the second dielectric material is formed at least partially around a portion of the first dielectric material.

14. The system of claim 11 , wherein the at least one first circuit includes a transmitter or a receiver and the at least one second circuit includes a transmitter or a receiver.

15. The system of claim 11 , further comprising a plurality of electrical contacts coupled to the first isolator component and a plurality of electrical contacts coupled to the third isolator component.

16. An integrated back-to-back isolator device comprising:
a substrate;
a first isolator component and a second isolator component positioned over the substrate, wherein the first isolator component is positioned to electromagnetically couple with the second isolator component;
a third isolator component and a fourth isolator component positioned over the substrate, wherein the third isolator component is positioned to electromagnetically couple with the fourth isolator component, wherein the second isolator component and the fourth isolator component are floating, and wherein the second isolator component is connected to the fourth isolator component by an electrical conductor;
a first dielectric region positioned between the first isolator component and the second isolator component; and
a second dielectric region positioned between the third isolator component and the fourth isolator component, wherein the first dielectric region is separated from the second dielectric region by at least one gap,
wherein the integrated back-to-back isolator device is configured to transfer signals from the first isolator component to the second isolator component, from the second isolator component to the fourth isolator component, and from the fourth isolator component to the third isolator component.

17. The integrated back-to-back isolator device of claim 16 , wherein the first dielectric region includes a first dielectric material and a second dielectric material having a higher permittivity than the first dielectric material.

18. The integrated back-to-back isolator device of claim 17 , wherein the second dielectric

Assignees

• Analog Devices Global Unlimited Co

Inventors

• O'Sullivan Laurence B
• Geary Shane
• Chen Baoxing
• Stenson Bernard Patrick
• Lambkin Paul
• Mcguinness Patrick M
• O'Brien Stephen
• Murphy Patrick J

Classifications

• H01F38/14 Primary

  Inductive couplings {(for wireless supply or distribution of electric power using inductive coupling H02J50/10)} · CPC title

• H04B10/802 Primary

  for isolation, e.g. using optocouplers · CPC title

• H01F2027/2809

  on stacked layers · CPC title

• H01G4/018

  Dielectrics · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title