Junction-isolated blocking voltage devices with integrated protection structures and methods of forming the same

US8796729B2 · kind B2 · utility

Assignee

• Analog Devices, Inc. · US

Inventors

• David J. Clarke · Bramford, GB
• Javier Alejandro Salcedo · North Billerica, US
• Brian B. Moane · Abbeyleix, IE
• Juan Luo · Longbeilingcun, CN
• Seamus Murnane · Bruff, IE
• Kieran Heffernan · Croom, IE
• John Twomey · Carrigaline, IE
• Stephen Denis Heffernan · Holycross, IE
• Gavin Patrick Cosgrave · Wexford, IE

Key dates

• Filing date: Nov 20, 2012
• Grant date: Aug 5, 2014
• Expiry date: Nov 20, 2032

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D84/611

Abstract

Junction-isolated blocking voltage devices and methods of forming the same are provided. In certain implementations, a blocking voltage device includes an anode terminal electrically connected to a first p-well, a cathode terminal electrically connected to a first n-well, a ground terminal electrically connected to a second p-well, and an n-type isolation layer for isolating the first p-well from a p-type substrate. The first p-well and the first n-well operate as a blocking diode. The blocking voltage device further includes a PNPN silicon controlled rectifier (SCR) associated with a P+ region formed in the first n-well, the first n-well, the first p-well, and an N+ region formed in the first p-well. Additionally, the blocking voltage device further includes an NPNPN bidirectional SCR associated with an N+ region formed in the first p-well, the first p-well, the n-type isolation layer, the second p-well, and an N+ region formed in the second p-well.