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. 17, 1992
Filed:
Apr. 30, 1990
Applicant:
Inventors:
Albert Y Chang, Poughkeepsie, NY (US);
Algirdas J Gruodis, Wappingers Falls, NY (US);
Dale E Hoffman, Stormville, NY (US);
Daniel E Skooglund, Wappingers Falls, NY (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
307270 ; 307455 ; 307475 ; 307494 ; 307254 ;
Abstract
A driver circuit is disclosed for use in testing bi-directional transceiver semiconductor products using a minimum of time and number of product accessing pins. The driver includes a pair of controllable amplitude current sources whose output currents are selectably switched into or partially away from the commonly connected emitters of a current switch. The current switch is energized by a variable voltage source and produces the output test voltage.