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:
Apr. 11, 2006
Filed:
Jun. 15, 2004
Allen W. Hairston, Andover, MA (US);
Allen W. Hairston, Andover, MA (US);
BAE Systems Information and Electronic Systems Integration INC, Nashua, NH (US);
Abstract
Techniques for precise removal of offset charge associated with the reset switch of an integration circuit are disclosed. Offset cancellation circuitry includes a single reset offset subtraction circuit and a replica integrator, which is configured identically to the integrators to be offset cancelled. An offset charge is generated by the circuitry and capacitively coupled to the target integrators. This generated offset charge causes voltage at the input node of each target integrator to substantially match the desired starting voltage level of the targeted integration process. Minimal additional space and circuitry is needed. All of the undesired offset charge is cancelled, without canceling any of the desired input current.