The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1979
Filed:
May. 25, 1977
Richard A Pedersen, New Tripoli, PA (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
A silicon semiconductor integrated logic circuit of the injection or merged transistor logic type has output contacts in which ohmic and Schottky barrier portions are combined. A portion of the surface region of each output transistor collector is converted to more heavily doped N-type conductivity so that a metal contact applied thereto makes low resistance contact to the more heavily doped portions but forms a contact of the Schottky barrier type to the more lightly doped portion. The effect of the Schottky contact portion is to control minority carrier storage in the collector of the NPN output transistor by forcing the hole excess density at the Schottky portion surface to be zero thereby enabling short propagation delay time.