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:
Dec. 25, 2001
Filed:
Aug. 22, 2000
Applicant:
Inventor:
Dean M. Umberger, Stouchsburg, PA (US);
Assignee:
Agere Systems Guardian Corp., Allentown, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K 1/704 ;
U.S. Cl.
CPC ...
H03K 1/704 ;
Abstract
An integrated ringing access switch circuit for telecommunications switching applications that provides improved dV/dt sensitivity at low operating power by using a pilot controlled rectifier, such as an SCR, that conducts at low ringing signal currents and operates to steer a bias current for causing a relatively larger controlled rectifier in parallel therewith to become conductive during higher load current operation. Also included is circuitry for preventing inadvertent turn-on of the SCRs in response to transient signals.