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:
Apr. 13, 1993
Filed:
Oct. 28, 1991
Philippe Perroud, Meylan, FR;
SGS-Thomson Microelectronics S.A., Gentilly, FR;
Abstract
A device switches a coil (2) between a first state (REC) where it is connected between a supply source (V.sub.REC) and ground through a variable current source (I.sub.REC), and a second state (PB) where it is connected between ground and the input of an amplifier (3) through a coupling capacitor (CC). The device comprises a first controlled switch (T.sub.PB) connected in parallel to the current source (I.sub.REC); a second controlled switch (T.sub.REC) placed between the supply source (V.sub.REC) and the coil (2); a threshold comparator (4, V.sub.T), the inputs of which are connected across the capacitor (CC); a logic control circuit (5) receiving a state control signal (REC/PB) and the output signal (V.sub.C) of the threshold comparator (4, V.sub.T) and, as a function of these signals, alternatively controlling switches (T.sub.PB, T.sub.REC) with no overlapping of their closed states.
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