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:
Sep. 06, 2005
Filed:
Jul. 05, 2002
Pierangelo Confalonieri, Caponago, IT;
Germano Nicollini, Piacenza, IT;
Riccardo Martignone, Carnate, IT;
Pierangelo Confalonieri, Caponago, IT;
Germano Nicollini, Piacenza, IT;
Riccardo Martignone, Carnate, IT;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
The circuit comprises a differential amplifier with two inputs and two outputs and a common mode regulation circuit. Between a regulation terminal of the amplifier and the outputs there are connected first and second capacitors and first and second capacitive elements that by controlled switches are connected in parallel with, respectively, the first and second capacitors or alternately between first and second reference voltage terminals. The common mode output voltage is not exactly fixed at the beginning of the design, but is determined by attributing appropriate values to the first and second capacitive elements; more particularly, their capacitances C3 and C4 are chosen in such a way as to satisfy the following equality:Vcmn=Vrefl+[(Vrefp−Vrefm)/2]*(C−C)/(C+C),