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:
May. 18, 1999
Andrea Milanesi, Casalnoceto, IT;
Vanni Poletto, Casale Monferrato, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A differential amplifier provides a high common mode rejection while maintaining substantially unchanged the input dynamic range. The differential amplifier includes a comparator having inputs to which are applied the two input signals, which are also applied to an operational amplifier, so that the comparator outputs a signal whose sign is indicative of the sign of the difference between the two input signals. The output of the operational amplifier is feedback to one of the inputs of the operational amplifier through a current mirror. This feedback signal is switched between the non-inverting input of the operational amplifier and the inverting input of the operational amplifier. The switching of the feedback signal ensures negative feedback, and is dependent upon the sign of the difference detected by the comparator.