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:
Mar. 22, 2005
Filed:
Dec. 18, 2002
Applicant:
Prabhuram Gopalan, Fremont, CA (US);
Inventor:
Prabhuram Gopalan, Fremont, CA (US);
Assignee:
Cypress Semiconductor Corporation, San Jose, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L029/737 ; H01L021/8222 ;
U.S. Cl.
CPC ...
Abstract
In one embodiment, a transistor is fabricated by forming a sacrificial emitter over a base, forming an oxide layer over the sacrificial emitter, removing a portion of the oxide layer, and then removing the sacrificial emitter. An emitter is later formed in the space formerly occupied by the sacrificial emitter. The sacrificial emitter allows a base implant step to be performed early in the process using a single masking step. The base may comprise epitaxial silicon-germanium or silicon.