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. 18, 2022
Filed:
Jul. 30, 2019
Allegro Microsystems, Llc, Manchester, NH (US);
Craig S. Petrie, Merrimack, NH (US);
Srujan Shivanakere, Nashua, NH (US);
Allegro MicroSystems, LLC, Manchester, NH (US);
Abstract
An isolation circuit that isolates a driver circuit that is biased at a first common mode voltage from a detection circuit that is biased at a second common mode voltage using isolation capacitors. The detection circuit includes a transimpedance amplifier having improved susceptibility to transient common-mode input signals and improved insensitivity to parasitic capacitance on the isolation capacitor terminals. Included within the transimpedance amplifier are circuits for mirroring current to convert the input current from the isolation capacitors into a voltage value and to amplify that voltage value. The transimpedance amplifier outputs a differential voltage value that is held by a latch circuit so that a comparator in the detection circuit can process the differential voltage value and output a differential signal with fully restored logic levels.