# US 2019/0172631 A1 · Integrated transformer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0172631 A1 - Document ID: US20190172631A1 - Status: Published application - Kind: A1 - Application number: 16/267,811 - Filed: 2019-02-05 - Published: 2019-06-06 - Earliest claimed: 2014-06-16 - Assignees: STMicroelectronics S.r.l. - Applicants: STMicroelectronics S.r.l. - Inventors: Vincenzo PALUMBO; Gabriella GHIDINI; Enzo CAROLLO; Fabrizio Fausto Renzo TOIA - Web page: https://patentgrep.com/patent/US20190172631A1 ## CPC - H01F 27/32: Insulating of coils, windings, or parts thereof - H01F 27/2804: {Printed windings} - H01F 27/323: {Insulation between winding turns, between winding layers} - H01F 41/063: with insulation - H10D 84/00: Integrated devices formed in or on semiconductor substrates that comprise only semiconducting layers, e.g. on Si wafers or on GaAs-on-Si wafers - H10W 20/497: {Inductive arrangements or effects of, or between, wiring layers} - H10W 44/20: at high-frequency [HF] or radio frequency [RF] - H10W 44/501: {Inductive arrangements (H10W44/20 takes precedence)} - H01F 27/2809: {on stacked layers} - H10W 44/00: Electrical arrangements for controlling or matching impedance - Y10T 29/49021: Magnetic recording reproducing transducer [e.g., tape head, core, etc.] - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An integrated transformer includes a primary winding and a secondary winding each having a spiral planar arrangement coils. A dielectric portion of dielectric material is interposed between the primary winding and the secondary winding. A field plate winding is electrically coupled with the primary winding. The field plate winding includes at least one field plate coil having a first lateral extension greater than a second lateral extension of a primary outer coil of the primary winding. The field plate coil is superimposed in plan view to the primary outer coil of the primary winding. ## Claims ### Claim 1 An integrated transformer, comprising: a primary winding; a secondary winding; wherein each of the primary and secondary windings is made of a metallic material and has a spiral planar arrangement comprising a corresponding plurality of coils; and a dielectric portion of dielectric material interposed between the primary winding and the secondary winding; a field plate winding electrically coupled with the primary winding, the field plate winding comprising at least one field plate coil having a lateral extension greater than a lateral extension of a primary outer coil of the primary winding with the at least one field plate coil overlapping in plan view the primary outer coil of the primary winding, the field plate winding being configured to mutually separate equipotential surfaces of an operating electric field at a secondary winding facing edge of the primary outer coil of the primary winding. ### Claim 2 (depends on 1) The integrated transformer according to claim 1, wherein the lateral extension of the at least one field plate coil is greater than the lateral extension of the primary outer coil by a distance such that a distribution of the equipotential surfaces of the operating electric field produces electric field peaks of equivalent value at the edge of the primary outer coil facing the secondary winding and of an edge of the at least one field plate coil facing the primary winding. ### Claim 3 (depends on 2) The integrated transformer according to claim 2, wherein the field plate winding comprises a strip of metallic material having a substantially spiral arrangement comprising a plurality of coils such as to correspond in plan view to the primary winding with each field plate coil electrically connected to a corresponding coil of the primary winding. ### Claim 4 (depends on 2) The integrated transformer according to claim 2, wherein the field plate winding and the primary winding are separated by at least one layer of insulating material, said distance being greater than a thickness of said insulating material. ### Claim 5 (depends on 4) The integrated transformer according to claim 4, wherein the at least one layer of insulating material comprises an attenuation layer having a dielectric coefficient greater than a dielectric coefficient of the dielectric portion. ### Claim 6 (depends on 5) The integrated transformer according to claim 5, wherein the attenuation layer is in contact with a lower surface of the at least one field plate coil and/or with a lower surface of the coils of the primary winding. ### Claim 7 (depends on 6) The integrated transformer according to claim 6, wherein the attenuation layer has a thickness corresponding to an extension of a region in which the equipotential surfaces of the operating electric field are closer in a corresponding transformer without the attenuation layer. ### Claim 8 (depends on 7) The integrated transformer according to claim 7, wherein the attenuation layer surrounds the at least one field plate coil and/or the coils of the primary winding. ### Claim 9 An integrated transformer, comprising: a primary winding; a secondary winding; wherein each of the primary and secondary windings is made of a metallic material and has a spiral planar arrangement comprising a corresponding plurality of coils; and a dielectric portion of dielectric material interposed between the primary winding and the secondary winding; and an attenuation layer having a dielectric coefficient greater than a dielectric coefficient of the dielectric portion, said attenuation layer positioned between an upper surface of the dielectric portion and a lower surface of the coils of the primary winding. ### Claim 10 (depends on 9) The integrated transformer according to claim 9, wherein the attenuation layer has a thickness corresponding to an extension of a region in which the equipotential surfaces of the operating electric field are closer in a corresponding transformer without the attenuation layer. ### Claim 11 (depends on 9) The integrated transformer according to claim 9, further comprising an additional attenuation layer which surrounds side surfaces and top surfaces of the coils of the primary winding. ### Claim 12 (depends on 9) The integrated transformer according to claim 9, further comprising a field plate winding electrically coupled with the primary winding, wherein the primary winding is positioned between the field plate winding and the secondary winding. ### Claim 13 (depends on 12) The integrated transformer according to claim 12, wherein the field plate winding comprises at least one field plate coil having a lateral extension greater than a lateral extension of a primary outer coil of the primary winding with the at least one field plate coil overlapping in plan view the primary outer coil of the primary winding, the field plate winding being configured to mutually separate equipotential surfaces of an operating electric field at a secondary winding facing edge of the primary outer coil of the primary winding.