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. 20, 2005
Filed:
Jan. 29, 2004
Christopher L. Fletcher, Santa Barbara, CA (US);
Martins Skele, Langley, WA (US);
Christopher L. Fletcher, Santa Barbara, CA (US);
Martins Skele, Langley, WA (US);
Raytheon Company, Waltham, MA (US);
Abstract
A low power delta-sigma analog to digital converterfor converting current mode signals without an amplifier includes an integration capacitora comparatorand a first switchin parallel with one another and coupled to an integration nodeA FETand the first switch are disposed in series between a dump capacitorand the integration node. A second switchoperates to discharge the dump capacitor, and an output of the comparator controls both switches in opposition. Preferably, no op-amps are included in the circuit, and current is supplied by an imaging componentIn a first comparator state, the first capacitor charges, the first switch is open and the second switch is closed, and the dump capacitor discharges. In a comparator second state, the first switch is closed and the second switch is open, and the integration capacitor transfers a fixed amount of charge into the dump capacitor through an injection FET operating in saturation.