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:
Nov. 08, 2005
Filed:
Feb. 04, 2004
Bumha Lee, Sunnyvale, CA (US);
Bumha Lee, Sunnyvale, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
DNL and INL errors are minimized in a pipelined converter that is arranged to use reference pre-sampling. An example first stage in the pipelined converter includes a sample/hold amplifier (SHA) circuit, an evaluator circuit, and a multiplying digital-to-analog converter (MDAC) circuit. The evaluator circuit evaluates the input signal in the converter while the SHA circuit samples the input signal. The MDAC samples the SHA output at substantially the same time it samples a reference voltage, where the reference voltage is adjusted in response to the output of the evaluator circuit. Errors due to capacitor mismatching are minimized such that the settling characteristics of the various amplifiers in the circuits dominate the DNL/INL performance.