Compensated MOS string and DAC employing such a potentiometric s

Details Compensated MOS string and DAC employing such a potentiometric s Compensated MOS string and DAC employing such a potentiometric s

1997-10-22

1999-08-24

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, H03M 168, H03M 178

Patent

active

059430001

ABSTRACT:
A digital-to-analog converter includes a potentiometric string suitable for realizing a relatively high number of bits that significantly reduces the silicon area requirement and simplifies mismatch compensation. The structure includes a first resistance string to realize a first DAC to convert a first number of most significative bits, and a second potentiometric string functionally connected in cascade to the first, but realized with MOS transistors. The structure of the invention allows the coupling of the two DACs in cascade by exploiting the MOS transistors that form the second potentiometric string, that is, the second DAC, thus avoiding the use of operational switches or amplifiers which may provide error sources. Moreover, the structure of the invention lends itself to the implementation of efficient compensation circuits for integral and differential linearity errors.

REFERENCES:
patent: 4543560 (1985-09-01), Holloway
patent: 4918448 (1990-04-01), Hauviller et al.
patent: 5111205 (1992-05-01), Morlon
patent: 5554986 (1996-09-01), Neidorff
patent: 5648780 (1997-07-01), Neidorff

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