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:
Feb. 26, 1980
Filed:
Feb. 15, 1978
Applicant:
Inventor:
Thomas P Redfern, San Jose, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 51 ; 2191 / ; 361271 ; 357 67 ;
Abstract
A capacitor suitable for integration into a monolithic integrated circuit is fabricated in two parallel connected sections. One section, using a thin oxide, constitutes most of the capacitance. A second section fabricated on a thick oxide constitutes a smaller capacitance per unit area but can be laser trimmed to provide a precise capacitance without damage to the integrated circuit. The trimmable section is desirably made using a conductive electrode material that is readily removed with laser energy.