Self calibration segmented digital-to-analog converter

Details Self calibration segmented digital-to-analog converter Self calibration segmented digital-to-analog converter

1996-07-30

1997-09-09

Gaffin, Jeffrey A.

Coded data generation or conversion

Converter calibration or testing

341121, 341118, 341145, H03M 110

Patent

active

056661185

ABSTRACT:
A method of self calibration for a segmented digital-to-analog converter is provided. The segmented digital-to-analog converter converts a digital input code to an analog output consisting of an analog output step and an analog calibration factor. The method comprises the step of determining a trim value for each segment of a segmented DAC. The method continues by storing the trim values in memory. Then, the trim values for a plurality of segments preselected to be enabled by a given digital input signal are summed, thereby producing a digital calibration factor associated with each given digital input signal. Last, storing each digital calibration factor in memory at an address corresponding to the associated digital input signal. Thereafter, when a particular digital input signal is received by the DAC, the preselected plurality of segmented current sources are switched to produce the analog output step, and the corresponding digital calibration factor is converted to the analog calibration factor and switched to the output of the segmented DAC.

REFERENCES:
patent: 5017919 (1991-05-01), Hull et al.
patent: 5153592 (1992-10-01), Fairchild et al.
Analog Devices, Design In Reference Manual, 1994, pp. 3-15 to 3-23 and 3-71 to 3-82 Aug. 1994.

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