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:
Jul. 31, 1990
Filed:
Jan. 04, 1989
Jean-Luc Berger, Grenoble, FR;
Marc Arques, Grenoble, FR;
Thomson-CSF, Paris, FR;
Abstract
The disclosure concerns photosensitive matrices and, more precisely, the read circuit connected to each of the output columns of the matrix. To reduce the noise of a transfer from a column to an output register, there is performed, N times successively, a transfer of the charge Qs to be read from the column to an intermediate storage zone, a duplication of this charge and a summation of the duplicated charges Qs*, and a restitution of the charge Qs to the column. If the transfer noises are decorrelated with respect to one another, the overall signal-to-noise ratio is improved in a ratio of N.sup.1/2. A fraction of the sum of the replica charges (for example the mean of the N replica charges) is transmitted to the output and constitutes the output signal of the read circuit.