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. 12, 2013
Filed:
Oct. 08, 2010
Applicant:
Jan C. Diffenderfer, Escondido, CA (US);
Inventor:
Jan C. Diffenderfer, Escondido, CA (US);
Assignee:
QUALCOMM Incorporated, San Diego, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 19/003 (2006.01);
U.S. Cl.
CPC ...
Abstract
A constant impedance driver provides controlled output slew rates. The driver includes a plurality of buffers, each with an output impedance that is multiple of the output impedance of the driver. Outputs of buffers are coupled in parallel to form the output of the driver. Inputs to the buffers are coupled to an input signal or delayed versions of the input signal. The buffer inputs may be selectively coupled to taps of a delay line to provide selected slew rates on the output of the driver. The buffers may be selectively enabled to change or calibrate the output impedance of the driver.