Circuit and method for DAC mismatch error detection and correction in an ADC

P.J.A. Harpe (Inventor)

Research output: PatentPatent publication

32 Downloads (Pure)

Abstract

A method comprises sampling an input voltage signal, comparing the sampled input voltage signal with an output signal of a feedback DAC, and determining an (N+1) bit code representation for a comparison result, the (N+1) bit code yielding the N bit output signal. On detection of the (N+1) bit code being equal to a predefined calibration trigger code, performing a calibration for a most significant bit of the (N+1) bit code by replacing the (N+1) bit code by an alternative (N+1) bit code that yields the same N bit output signal, performing an additional comparison cycle using the alternative (N+1) bit code, determining, using comparison results of the additional comparison cycle and the preceding (N+1)th cycle, a sign of a DAC capacitor mismatch error, and tuning programmable binary scaled calibration capacitors in parallel to a capacitor corresponding to the one of the most significant bits of the (N+1) bit code.
Original languageEnglish
Patent numberUS9397679 B1
Priority date19/02/15
Publication statusPublished - 19 Jul 2016

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