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:
Jun. 12, 2012
Filed:
Mar. 15, 2011
Andre Luis Vilas Boas, Campinas, BR;
Andre L. R. Mansano, The Hague, NL;
Alfredo Olmos, Austin, TX (US);
Fabio DE Lacerda, Niteroi, BR;
Andre Luis Vilas Boas, Campinas, BR;
Andre L. R. Mansano, The Hague, NL;
Alfredo Olmos, Austin, TX (US);
Fabio de Lacerda, Niteroi, BR;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A switched-capacitor amplifier circuit (and) with rail-to-rail capability without requiring a rail-to-rail operational amplifier includes a switched-capacitor amplifier (and) and an input network () coupled to the switched-capacitor amplifier. The switched-capacitor amplifier includes a non-rail-to-rail operational amplifier (and). The input network prevents the non-rail-to-rail operational amplifier from receiving an input differential signal that has a common-mode voltage at or near rails of the non-rail-to-rail operational amplifier. Voltages at input terminals of the operational amplifier remain near analog ground, which is an arbitrary voltage level between the rails, during both phases of switching in the switched-capacitor amplifier. In one embodiment, the switched-capacitor amplifier uses a correlated double sampling technique.