Analog Devices International Unlimited Company

Analog Devices Global

Catriona Marie O'Sullivan

Shane Patrick Geary

Edward John Coyne

Alan Brannick

Shane Tooher

Breandán Pol Og Ó hAnnaidh

Patrick Martin McGuinness

Jan Kubik

Michael Noel Morrissey

Shane Geary

Breandán Pol Og ÓhAnnaidh

Breandan Pol Og O Hannaidh

Patrick Mcguinness

A bipolar junction transistor is provided with an emitter structure that is positioned above the upper surface of the base region. The thickness of the emitter and the interfacial oxide thickness between the emitter and the base is configured to optimize a gain for a given type of transistor. A method of fabricating PNP and NPN transistors on the same substrate using a complementary bipolar fabrication process is provided. The method enables the emitter structure for the NPN transistor to be defined separately to that of the PNP transistor. This is achieved by epitaxially growing the emitter layer for the PNP transistor and growing the emitter layer for the NPN transistor in a thermal furnace.

Bipolar junction transistor, and a method of forming an emitter for a bipolar junction transistor

A bipolar junction transistor is provided with a multilayer collector structure. The layers of the collector are individually grown in separate epitaxial growth stages. For a PNP transistor, each layer, after it is grown, is doped with a p-type dopant in a dedicated implant stage. By providing separate epitaxial growth stages and separate dopant implant stages for each layer of the collector, the dopant concentration profile in the collector region can be better controlled to optimize the speed and breakdown voltage of a bipolar junction transistor.

Bipolar junction transistor, and a method of forming a collector for a bipolar junction transistor

A charge control structure is provided for a bipolar junction transistor to control the charge distribution in the depletion region extending into the bulk collector region when the collector-base junction is reverse-biased. The charge control structure comprises a lateral field plate above the upper surface of the collector and dielectrically isolated from the upper surface of the collector and a vertical field plate which is at a side of the collector and is dielectrically isolated from the side of the collector. The charge in the depletion region extending into the collector is coupled to the base as well as the field-plates in the charge-control structure, instead of only being coupled to the base of the bipolar junction transistor. In this way, a bipolar junction transistor is provided where the dependence of collector current on the collector-base voltage, also known as Early effect, can be reduced.

Bipolar junction transistor, and a method of forming a charge control structure for a bipolar junction transistor

A magnetic core is provided for an integrated circuit, the magnetic core comprising: a plurality of layers of magnetically functional material; a plurality of layers of a first insulating material; and at least one layer of an secondary insulating material; wherein layers of the first insulating material are interposed between layers of the magnetically functional material to form subsections of the magnetic core, and the at least one layer of second insulating material is interposed between adjacent subsections.

Magnetic core for use in an integrated circuit, an integrated circuit including such a magnetic core, a transformer and an inductor fabricated as part of an integrated circuit

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Kilcornan, Ireland

Catriona Marie O'Sullivan