TY - JOUR
T1 - A compact dynamic-performance-improved current-steering DAC with random rotation-based binary-weighted selection
AU - Lin, Wei Te
AU - Kuo, Tai Haur
N1 - Funding Information:
Manuscript received June 02, 2011; revised August 23, 2011; accepted September 03, 2011. Date of publication October 24, 2011; date of current version January 27, 2012. This paper was approved by Associate Editor Boris Murmann. This work was supported in part by the National Science Council under Grant NSC 99-2221-E-006-218-MY3.
PY - 2012/2
Y1 - 2012/2
N2 - Conventional binary-weighted current-steering DACs are generally operated with current groups where each group is binary-weighted and formed with predetermined members of a unit current-source array. This paper proposes a random rotation-based binary-weighted selection (RRBS) that efficiently performs dynamic-element matching (DEM) by randomly rotating the sequence of these units to form new binary-weighted current groups for each DAC output. Without using binary-to-thermometer decoders, RRBS features its simplicity and compactness of DEM realization. Compared to conventional binary-weighted DACs, RRBS DACs are insensitive to the mismatch of small-size current-sources and exhibit better dynamic performance. A 10-bit RRBS DAC is implemented with only 0.034 mm 2 in a standard 1P6M 1.8 V 0.18 μm CMOS process. Measured performance achieves >61 dB spurious-free dynamic range (SFDR) in the Nyquist bandwidth with 500 MS/s, while its active area is less than one-tenth of that required by state-of-the-art 10-bit current steering DACs. To the best of our knowledge, the proposed RRBS implements the smallest area for high-speed current-steering DACs up to now. Its SFDR is also comparable to that of 12-bit published designs. Three popular figures-of-merit (FOMs) are used to compare this design with other state-of-the-art 10-12-bit DACs, with the proposed design performing best with 2 FOMs.
AB - Conventional binary-weighted current-steering DACs are generally operated with current groups where each group is binary-weighted and formed with predetermined members of a unit current-source array. This paper proposes a random rotation-based binary-weighted selection (RRBS) that efficiently performs dynamic-element matching (DEM) by randomly rotating the sequence of these units to form new binary-weighted current groups for each DAC output. Without using binary-to-thermometer decoders, RRBS features its simplicity and compactness of DEM realization. Compared to conventional binary-weighted DACs, RRBS DACs are insensitive to the mismatch of small-size current-sources and exhibit better dynamic performance. A 10-bit RRBS DAC is implemented with only 0.034 mm 2 in a standard 1P6M 1.8 V 0.18 μm CMOS process. Measured performance achieves >61 dB spurious-free dynamic range (SFDR) in the Nyquist bandwidth with 500 MS/s, while its active area is less than one-tenth of that required by state-of-the-art 10-bit current steering DACs. To the best of our knowledge, the proposed RRBS implements the smallest area for high-speed current-steering DACs up to now. Its SFDR is also comparable to that of 12-bit published designs. Three popular figures-of-merit (FOMs) are used to compare this design with other state-of-the-art 10-12-bit DACs, with the proposed design performing best with 2 FOMs.
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U2 - 10.1109/JSSC.2011.2168651
DO - 10.1109/JSSC.2011.2168651
M3 - Article
AN - SCOPUS:84856497565
SN - 0018-9200
VL - 47
SP - 444
EP - 453
JO - IEEE Journal of Solid-State Circuits
JF - IEEE Journal of Solid-State Circuits
IS - 2
M1 - 6059519
ER -