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. 26, 2000
Filed:
Dec. 14, 1998
Liusheng Liu, Singapore, SG;
Lee Tay Chew, Singapore, SG;
Tritech Microelectronics, Ltd., Singapore, SG;
Abstract
Disclosed is a fully differential switched-capacitor integrator which accepts a single-ended or unbalanced input signal and compensates the offset and finite gain of the operational amplifier without an extra converter circuit. The proposed circuit utilizes a special input structure which adds special capacitors to store the offset and the low frequency noise of the operational amplifier. One preferred embodiment implements the switching means as transmission gates using CMOS transistors. Clock feedthrough is prevented by providing two non-overlapping clock phases with a delayed clock each, thus avoiding clock feed-through. The invention provides a good alternative for applications such as low noise filters and sigma delta modulators.