Abstract
In this paper, we propose an area-efficient high-resolution
resistor-string digital-to-analog converter (R-DAC) with a reverse
ordering scheme for active matrix flat-panel display data driver ICs. The
proposed R-DAC is implemented in a two-stage DAC along with a DAC-embedded
amplifier. The reverse ordering scheme reduces the area of the proposed
R-DAC, which occupies most of the area of the data driver IC. To verify
the reverse ordering scheme, a 640-channel data driver IC with a 12-bit
two-stage DAC was fabricated using a 0.18-
$\mu{m}$
CMOS process with 1.8 V and 18 V devices. The fabricated
12-bit two-stage DAC comprises a 10-bit R-DAC with the reverse ordering
scheme and a 2-bit DAC-embedded amplifier. The proposed 10-bit R-DAC
occupies only 50.1% of the area of a conventional 10-bit R-DAC. The
measurement results show that the differential nonlinearity and integral
nonlinearity are
$ + {0.25}/ - {0.26}$
LSB and
$ + {0.54}/ - {0.42}$
LSB, respectively. The measured inter-channel and
inter-chip deviation of voltage outputs are 2.40 and 7.42 mV,
respectively.
© 2016 IEEE
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