Method for calibrating a digital-to-analog converter and a...

Details Method for calibrating a digital-to-analog converter and a... Method for calibrating a digital-to-analog converter and a...

2006-04-11

2006-04-11

Young, Brian (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S144000

Reexamination Certificate

active

07026967

ABSTRACT:
The invention describes a method for digitally calibrating a segmented current-steering D/A-converter. One embodiment of the present invention is a 14-bit DAC, where 6 MSB's are converted with two unweighted current source array. Further, in this invention a new method for organising the switching order based on the analysed data of mismatch of the current sources is presented. A programmable mapping device is used instead of the fixed thermometer decoding before the switch array. Using this programmable mapping device the switching order of the current switches can be selected optimally so that the error in the resulting analog signal is minimised. The switching order is programmed to the mapping device on the basis of the calibration method according to the present invention. The inventive amendment is aimed at processing errors which cause poor matching inside the component itself. This amendment is done by rearranging unweighted unity current switches into a more optimum order.

REFERENCES:
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patent: 0 898 374 (1999-02-01), None
patent: 0 929 158 (1999-07-01), None

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