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:
Jan. 02, 2001
Filed:
Jul. 02, 1997
Applicant:
Inventor:
John E. Hanna, Chandler, AZ (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 1/00 ;
U.S. Cl.
CPC ...
H04M 1/00 ;
Abstract
Alert amplifier (,) has a peak detector (,) and an operational amplifier (,) that dynamically set a bias voltage of a transducer (,) to minimize the standby current. In the absence of an input ring signal at an input terminal (,), the standby current in the transducer (,) is zero. The bias voltage to the transducer (,) is adjusted from a reference voltage downward in accordance with the input ring signal to minimize the current in the transducer (,) during the activation of the alert amplifier (,).