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:
May. 20, 1997
Filed:
Jun. 10, 1996
Yasuyuki Nakamura, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method and apparatus for testing the linearity of a digital-to-analog converter that uses equally-weighted signal sources to convert high-order bits of digital input, and unequally-weighted signal sources to convert low-order bits. Minimum and maximum digital inputs are supplied, and a linear input-output characteristic is calculated from the two resulting analog output values. The nonlinearity error is calculated by finding the deviations from this linear input-output characteristic of two sets of analog output values: one set obtained by varying the high-order bits while holding the low-order bits constant; the other set obtained by varying the low-order bits while holding the high-order bits constant.