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. 05, 2013
Filed:
Nov. 30, 2010
Rouying Zhan, Gilbert, AZ (US);
Amaury Gendron, Scottsdale, AZ (US);
Chai Ean Gill, Chandler, AZ (US);
Rouying Zhan, Gilbert, AZ (US);
Amaury Gendron, Scottsdale, AZ (US);
Chai Ean Gill, Chandler, AZ (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A stackable electrostatic discharge (ESD) protection clamp () for protecting a circuit core () comprises, a bipolar transistor () having a base region () with a base contact () therein and an emitter () spaced a lateral distance Lbe from the base contact (), and a collector () proximate the base region (). The base region () comprises a first portion () including the base contact () and emitter (), and a second portion () with a lateral boundary () separated from the collector () by a breakdown region () whose width D controls the clamp trigger voltage, the second portion () lying between the first portion () and the boundary (). The damage-onset threshold current Itof the ESD clamp () is improved by increasing the parasitic resistance Rbe of the emitter-base region (), by for example, increasing Lbe or decreasing the relative doping density of the first portion () or a combination thereof.