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:
Jul. 27, 1999
Filed:
Aug. 29, 1997
Carlo Maria Milanese, Olevano, IT;
Mauro Pasetti, Milan, IT;
SGS-Thomson Microelectronics S.r.l., Agrate Brianza, IT;
Abstract
The present invention relates to a control signal generation circuit for telephone charge indicators comprising a capacitor having a first and a second terminals connected to ground through respectively a first and a second switches with the first terminal of the capacitor being also connected through a third switch to a constant current generator which is connected to a positive power supply line with respect to ground. The second terminal of the capacitor is connected to a constant current generator which is connected to a negative power supply line with respect to ground. The first and second terminals are also connected through respectively a first and a second resistance to a circuit node coupled to an output terminal.