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. 05, 2010
Filed:
Apr. 20, 2005
Thierry Masson, Varces, FR;
Fabrice Salvi, Grenoble, FR;
Thierry Masson, Varces, FR;
Fabrice Salvi, Grenoble, FR;
Atmel Grenoble, , FR;
Abstract
The invention relates to electronic circuits for measuring, by synchronous detection, weak signals whose reference level is not well known and is subject to large fluctuations. A first correlated double sampling is performed between a time Tsituated just before the start of the measurement pulse and a time Tsituated just before the end of the measurement pulse; subsequently, a second correlated double sampling is performed between time Tand a time Tsituated after the end of the measurement pulse. Finally, the difference between signal levels coming from the two measurements is taken, this difference being a representation of the signal value Vm considered with respect to a reference level that is intermediate between the reference levels at times Tand T