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:
Jul. 22, 2003
Filed:
Apr. 29, 2002
Alexander Bugeja, Acton, MA (US);
Engim, Inc., Acton, MA (US);
Abstract
A sample and hold circuit including a capacitor is charged to a sample voltage from an open loop circuit such as a transistor circuit controlled by an input voltage. The sample voltage on the capacitor is converted to a digital signal via an ADC (Analog to Digital Converter). A digital correction circuit compensates for differences in voltage between the sample voltage on the capacitor and the input voltage based on properties of the open loop circuit and successive sample voltages on the capacitor. Consequently, nonlinearities can be compensated so that use of an open loop circuit or transistor circuit is less likely to negatively impact an overall accuracy of the ADC device.