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:
Nov. 04, 2008
Filed:
Feb. 06, 2007
Switched capacitor amplifier circuit and method for operating a switched capacitor amplifier circuit
Kiyoshi Yoshikawa, Chiba, JP;
Kiyoshi Yoshikawa, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
Provided are a switched capacitor amplifier capable of removing an influence of an offset voltage and a 1/f noise using a simple circuit, and a method of operating the same. According to the present invention, a switched capacitor amplifier having an operational amplifier and switched capacitors includes: a first switched capacitor one terminal of which is connected with a plus (+) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a second switched capacitor one terminal of which is connected with a minus (−) input terminal of the operational amplifier and another terminal of which is applied with an input voltage; a third switched capacitor which is inserted between the plus (+) input terminal and a plus (+) output terminal and provided to set an amplification factor in cooperation with the first switched capacitor and store a plus (+) compensation voltage for compensating for an offset, which is applied to the plus (+) input terminal; and a fourth switched capacitor which is inserted between the minus (−) input terminal and a minus (−) output terminal and provided to set an amplification factor in cooperation with the second switched capacitor and store a minus (−) compensation voltage for compensating for an offset, which is applied to the minus (−) input terminal.