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:
Dec. 10, 2002
Filed:
May. 29, 2001
Hisao Kunitani, Kyoto, JP;
Atsuhisa Kageyama, Ibaraki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A large number of analog signals (Aa, Ba . . . Na) are time-division-multiplexed by an analog switch ( ) into a single analog signal (c). The multiplexed analog signal (c) is converted by an A/D conversion circuit ( ) into a digital signal (d). The digital signal (d) is separated by a signal separation circuit ( ) into a large number of digital signals (e) respectively corresponding to the analog signals (Aa, Ba . . . Na). Each digital signal (e) is compared by a comparison circuit (9) with a digital reference value (f) having a predetermined value. A current source control circuit ( ) generates a digital control signal (g) according to the amount of shift in the digital signal (e) with respect to the digital reference value (f), and the current source ( ) is controlled by the control signal (g). Therefore, the clamp level of an analog signal is adjusted to a predetermined level with a high precision, thereby effectively suppressing the level shift thereof.