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:
Aug. 10, 1999
Filed:
Jun. 11, 1997
Yasuo Nagazumi, Tokyo, 153, JP;
C.D.S. Co., Ltd., Tokyo, JP;
Other;
Abstract
The object of the present invention is to obtain a charge domain signal filter by composing an digital filter circuit with analog/digital mixed circuit and by introducing the analog processing into the process of multiplication and addition consuming the most of the electric power so as to reduce the total power consumption. The present invention is composed of at least one AD converter; at least one reference charge supply unit; a coefficient supply unit for supplying coefficient signals; a plurality of DA converters acting in a charge domain for receiving digital signal outputs supplied from said AD converter and said coefficient signal supply unit, and for performing the multiplication type DA conversion using, as a reference signal, a reference charge packet generated by said reference charge supply unit; and one circuit of analog shift register composed of N stages of charge transfer devices.