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:
Feb. 18, 2014
Filed:
Nov. 26, 2012
Gabriel Banarie, Murroe, IE;
Adrian Sherry, Raheen, IE;
Gabriel Banarie, Murroe, IE;
Adrian Sherry, Raheen, IE;
Analog Devices, Inc., Norwood, MA (US);
Abstract
A sigma-delta analog-to-digital converter ('ΣΔ ADC') may include a loop filter, ADC, a feedback digital-to-analog converter ('DAC'), and a control circuit. The feedback DAC may include several unit elements (resistors, capacitors, or current sources) that, ideally, are identical to each other but vary due to mismatch errors introduced during manufacture. Mismatch errors may introduce signal errors that generate undesirable noise frequencies and non-linearities in a ΣΔ ADC output signal. Embodiments of the present invention provide a stability corrected second order shuffler that allows for the shaping of the frequency response by the ΣΔ ADC to reduce the effect of the mismatch error between DAC unit elements. The second order shuffler may include accumulation correctors, to suppress saturation for accumulators within the shuffler. The suppression may compress the range of accumulation values for each accumulator while maintaining context for the values to stabilize operation of the second order shuffler.