Publication

A DAC Mismatch Calibration Technique for Multibit Sigma Delta Modulators

Pierre-André Farine, Steve Tanner, Shafqat Ali
2013
Conference Papers

Abstract

A technique for the calibration of DAC (digital to analog converter) mismatch errors in multi-bit Sigma Delta modulators (SDM) is presented. It consists of two parts: the first is a measurement technique to obtain the relative mismatch of each feedback DAC element. The second is a correction method applied to the modulator output to correct for the effect of DAC non linearity. The proposed technique works completely in the background. The paper presents a detailed analysis of the possible error sources affecting the accuracy of the calibration, as well as a comparison with other state of the art techniques. The technique is applied to a 3rd order SDM showing almost ideal characteristics after calibration.

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https://infoscience.epfl.ch/entities/publication/5c8764db-6e0b-4fbd-b708-25005ec361a2

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Pierre-André Farine, Steve Tanner, Shafqat Ali
2013
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5c8764db-6e0b-4fbd-b708-25005ec361a2

About this result

Related concepts (9)

Analog-to-digital converter

In electronics, an analog-to-digital converter (ADC, A/D, or A-to-D) is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal. An ADC may also provide an isolated measurement such as an electronic device that converts an analog input voltage or current to a digital number representing the magnitude of the voltage or current. Typically the digital output is a two's complement binary number that is proportional to the input, but there are other possibilities.

Digital-to-analog converter

In electronics, a digital-to-analog converter (DAC, D/A, D2A, or D-to-A) is a system that converts a digital signal into an analog signal. An analog-to-digital converter (ADC) performs the reverse function. There are several DAC architectures; the suitability of a DAC for a particular application is determined by figures of merit including: resolution, maximum sampling frequency and others. Digital-to-analog conversion can degrade a signal, so a DAC should be specified that has insignificant errors in terms of the application.

Error correction code

In computing, telecommunication, information theory, and coding theory, forward error correction (FEC) or channel coding is a technique used for controlling errors in data transmission over unreliable or noisy communication channels. The central idea is that the sender encodes the message in a redundant way, most often by using an error correction code or error correcting code (ECC). The redundancy allows the receiver not only to detect errors that may occur anywhere in the message, but often to correct a limited number of errors.

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