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. 26, 2010
Filed:
Sep. 12, 2007
Pratap N Singh, Varanasi, IN;
Chandrajit Debnath, Greater Noida, IN;
Rakesh Malik, Noida, IN;
Ashish Kumar Sharma, Ghaziabad, IN;
Pratap N Singh, Varanasi, IN;
Chandrajit Debnath, Greater Noida, IN;
Rakesh Malik, Noida, IN;
Ashish Kumar Sharma, Ghaziabad, IN;
STMicroelectronics Pvt. Ltd., Greater Noids, Uttar Pradesh, IN;
Abstract
Embodiments of the present invention provide a low voltage continuous time common mode feedback (CMFB) module, for low voltage operational amplifiers, providing good linearity, wide bandwidth and low systematic offset. The common mode feedback module includes a controlling module and an initializing module. The controlling module and the initializing module are parallel common mode feedback loops. The controlling module is a main CMFB loop and the initializing module is an auxiliary CMFB loop and both the loops work simultaneously. The controlling module and the initializing module receive a first differential input voltage and a second differential input voltage supplied by differential outputs of a main differential amplifier. Both the CMFB loops are low gain amplifiers in order to provide operation as linear as possible over the entire differential output operating range of the main differential amplifier.