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:
Aug. 09, 1994
Filed:
Jul. 30, 1992
Winston M Gadsby, Herndon, VA (US);
Hubbell Incorporated, Orange, CT (US);
Abstract
A correction circuit for use with a subscriber line interface circuit (SLIC) to control the level of a DC voltage supplied to the tip and ring wires of a telephone circuit includes a current sink with a differential operational amplifier. The amplifier output terminal is connected through an output resistor to a control input of the SLIC which influences the DC voltage level. The non-inverting input terminal of the amplifier is connected to the tip or ring wire, or both, and the inverting input terminal is connected to the output resistor and a DC reference circuit. The level of the voltage supplied by the SLIC is a function of the current supplied by the correction circuit.