Methodology for the Digital Calibration of Analog Circuits and Systems

jswon

Methodology for the Digital Calibration of Analog Circuits and Systems: with Case Studies



Paperback: 257 pages
Data: January 15, 2006
Format: PDF
Description:Methodology for the Digital Calibration of Analog Circuits and Systemsshows how to relax the extreme design constraints in analog circuits,allowing the realization of high-precision systems even withlow-performance components. A complete methodology is proposed, andthree applications are detailed.

To start with, an in-depthanalysis of existing compensation techniques for analog circuitimperfections is carried out. The M/2+M sub-binary digital-to-analogconverter is thoroughly studied, and the use of this very low-areacircuit in conjunction with a successive approximations algorithm fordigital compensation is described. A complete methodology based on thiscompensation circuit and algorithm is then proposed. The detection andcorrection of analog circuit imperfections is studied, and a simulationtool allowing the transparent simulation of analog circuits withautomatic compensation blocks is introduced.

The firstapplication shows how the sub-binary M/2+M structure can be employed asa conventional digital-to-analog converter if two calibration and radixconversion algorithms are implemented.

The second application, aSOI 1T DRAM, is then presented. A digital algorithm chooses a suitablereference value that compensates several circuit imperfectionstogether, from the sense amplifier offset to the dispersion of thememory read currents.

The third application is the calibrationof the sensitivity of a current measurement microsystem based on a Hallmagnetic field sensor. Using a variant of the chopper modulation, thespinning current technique, combined with a second modulation of areference signal, the sensitivity of the complete system iscontinuously measured without interrupting normal operation. A thermaldrift lower than 50 ppm/°C is achieved, which is 6 to 10 times lessthan in state-of-the-art implementations. Furthermore, the calibrationtechnique also compensates drifts due to mechanical stresses and ageing.

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