Back to results
US 4,541,000 AGranted
Varactor or mixer diode with surrounding substrate metal contact and top surface isolation
AssigneeTelefunken electronic GmbH
InventorsAlexander Colquhoun, Erhard Kohn
Life of this patent
Estimating the term…
Abstract
A varactor or mixer diode comprises a mesa shaped semiconductor element having a p-n junction barrier layer or retifying junction on its upper face and a substrate contact on its opposite face, the substrate contact extending over the side faces of the semiconductor element and ending at a small spacing from the barrier layer or junction.
Claims15
A varactor or mixer diode comprising:
- a semiconductor element which has a mesa shape with inclined side faces;
- a rectifying pn-junction or a rectifying metal semiconductor junction (Schottky contact) on the upper face of said mesa shaped semiconductor element;
- a metal plate forming an ohmic substrate contact disposed on the lower face of said mesa shaped semiconductor element, said substrate contact having a metal portion which completely extends over said side faces of said semiconductor element onto said upper face which is provided with said rectifying junction, and which ends at a small spacing from said junction;
- and an electrical isolation means disposed in said upper face for separating said junction from said metal portion.
1 more element
A varactor or mixer diode comprising:
- a mesa shaped semiconductor element, a pn-junction barrier layer or rectifying metal semiconductor junction on the upper face of said semiconductor element, an ohmic substrate contact having a first portion in the form of a metal plate disposed on a face of said semiconductor body opposite to said upper face and having a further metal portion extending completely over the sides of said semiconductor body and onto said upper face, and ending on said upper face at a small spacing from said barrier layer or junction, and electrical isolation means, disposed in said upper face and surrounding said junction, for separating said junction from said metal portion.
Dependencies are inferred from the claim text.