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:
Feb. 26, 2008
Filed:
Mar. 28, 2006
Chopper amplifier circuit apparatus operable at low voltage utilizing switched operational amplifier
Takeshi Yoshida, Hiroshima, JP;
Atsushi Iwata, Hiroshima, JP;
Mamoru Sasaki, Hiroshima, JP;
Takayuki Mashimo, Tokyo, JP;
Yoshihiro Masui, Hiroshima, JP;
Junji Nakatsuka, Osaka, JP;
Takeshi Yoshida, Hiroshima, JP;
Atsushi Iwata, Hiroshima, JP;
Mamoru Sasaki, Hiroshima, JP;
Takayuki Mashimo, Tokyo, JP;
Yoshihiro Masui, Hiroshima, JP;
Junji Nakatsuka, Osaka, JP;
Semiconductor Technology Academic Research Center, Kanagawa, JP;
Abstract
In a chopper amplifier circuit operable at a low voltage utilizing a switched operational amplifier, a chopper modulator chopper-modulates an input signal according to a predetermined control signal, and outputs a chopper-modulated signal. An amplifier circuit constituted by the switched operational amplifier amplifies the chopper-modulated signal outputted from the chopper modulator, and outputs an amplified chopper-modulated signal. A chopper-demodulator of the switched operational amplifier chopper-demodulates the amplified chopper-modulated signal outputted from the amplifier circuit according to the control signal, and outputs a demodulated output signal as a chopper-amplified output signal from an output terminal. A chopper modulator chopper-modulates a demodulated signal outputted from the chopper demodulator according to the control signal, and outputs a chopper-modulated signal to an input terminal of the amplifier circuit.