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. 08, 2008
Filed:
Dec. 22, 2004
Masatoshi Matsushita, Kanagawa, JP;
Tomio Aida, Tokyo, JP;
Yasutaka Uramoto, Kanagawa, JP;
Matshushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A DC offset cancel circuit includes an analog adderto whose one input a baseband analog signal output from a high-frequency reception section is input and to whose other input an analog correction signal output from a D/A converteris input, and which corrects the reference voltage value of the baseband analog signal analogically to cancel a DC offset, an adderwhich has the output of the A/D converteras its one input and subtracts the lower bits of a sample value stored in a memoryto be described later as a DC offset value from the input value and outputs the resultant value, a control circuitwhich outputs an output digital value of the A/D converteras a sample value to the memoryand a D/A converterwhich converts a digital value of the upper bits of a sample value stored in the memoryto an analog correction signal and outputs the analog correction signal to the analog adder