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:
Jun. 19, 2001
Filed:
Apr. 14, 2000
Applicant:
Inventors:
William E. Main, Mesa, AZ (US);
Danielle L. Coffing, Tempe, AZ (US);
Jeffrey Durec, Chandler, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 7/556 ; G06F 7/24 ;
U.S. Cl.
CPC ...
G06F 7/556 ; G06F 7/24 ;
Abstract
An improved logarithmic amplifier (,) and method in which a signal at an output (,) is logarithmic with respect to the voltage supplied at a gain control input (,). The logarithmic amplifier (,) includes a first amplifier stage (,) and a second amplifier stage (,) which are coupled together by a current mirror stage (,). Alternative embodiments of logarithmic amplifier (,) and (,) include different biasing methods for biasing the second amplifier stage (,).