METHODOLOGY FOR THE DIGITAL CALIBRATION OF ANALOG CIRCUITS AND SYSTEMS

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Methodology for the Digital Calibration of Analog Circuits and Systems: with Case Studies
257 pages | Springer; 1 edition | January 15, 2006 | 9781402042522 | 2 Mb
Methodology for the Digital Calibration of Analog Circuits and Systems shows how to relaxthe extreme design constraints in analog circuits, allowing therealization of high-precision systems even with low-performancecomponents. A complete methodology is proposed, and three applicationsare detailed.

To start with, an in-depth analysis of existing compensation techniquesfor analog circuit imperfections is carried out. The M/2+M sub-binarydigital-to-analog converter is thoroughly studied, and the use of thisvery low-area circuit in conjunction with a successive approximationsalgorithm for digital compensation is described. A complete methodologybased on this compensation circuit and algorithm is then proposed. Thedetection and correction of analog circuit imperfections is studied,and a simulation tool allowing the transparent simulation of analogcircuits with automatic compensation blocks is introduced.

The first application shows how the sub-binary M/2+M structure can beemployed as a conventional digital-to-analog converter if twocalibration and radix conversion algorithms are implemented.

The second application, a SOI 1T DRAM, is then presented. A digitalalgorithm chooses a suitable reference value that compensates severalcircuit imperfections together, from the sense amplifier offset to thedispersion of the memory read currents.

The third application is the calibration of the sensitivity of acurrent measurement microsystem based on a Hall magnetic field sensor.Using a variant of the chopper modulation, the spinning currenttechnique, combined with a second modulation of a reference signal, thesensitivity of the complete system is continuously measured withoutinterrupting normal operation. A thermal drift lower than 50 ppm/°C isachieved, which is 6 to 10 times less than in state-of-the-artimplementations. Furthermore, thecalibration technique also compensates drifts due to mechanical stresses and ageing.

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