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:
Mar. 24, 2009
Filed:
Feb. 06, 2007
Hirokazu Yoshizawa, Fukaya, JP;
Ryoichi Anzai, Chiba, JP;
Toshiyuki Uchida, Chiba, JP;
Akira Takeda, Chiba, JP;
Minoru Ariyama, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Hirokazu Yoshizawa, Fukaya, JP;
Ryoichi Anzai, Chiba, JP;
Toshiyuki Uchida, Chiba, JP;
Akira Takeda, Chiba, JP;
Minoru Ariyama, Chiba, JP;
Atsushi Igarashi, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Gakkouhoujin Chikoujigakuen, Saitama, JP;
Abstract
Provided is a chopper amplifier circuit capable of eliminating an influence of a slew rate of an amplifier and suppressing spike generation to thereby obtain an output signal having little harmonic distortion. The chopper amplifier circuit according to the present invention includes: a first chopper circuit for chopping an input signal by a first pulse and a second pulse shifted from each other in phase by a half cycle, switching a relation of connection between an input terminal pair and an output terminal pair at a timing of the chopping, and outputting the input signal as a modulated signal; an amplifier for amplifying the modulated signal and outputting the modulated signal thus amplified as an amplified signal; a first sample hold circuit for holding the amplified signal at the first pulse and outputting the amplified signal at the second pulse; and a second sample hold circuit for holding the amplified signal at the second pulse and outputting the amplified signal at the first pulse.