TY - JOUR
T1 - Low-cost 14-bit current-steering DAC with a randomized thermometer-coding method
AU - Lee, Da Huei
AU - Kuo, Tai Haur
AU - Wen, Kow Liang
N1 - Funding Information:
Manuscript received June 28, 2008; revised October 3, 2008. First published February 13, 2009; current version published February 25, 2009. This work was supported in part by the Megawin Technology Company, Ltd., Hsinchu, Taiwan, and in part by the National Science Council of Taiwan under Grant NSC95-2221-E-006-447-MY3. This paper was recommended by Associate Editor P. Malcovati.
PY - 2009
Y1 - 2009
N2 - A dynamic element-matching (DEM) method, i.e., randomized thermometer coding (RTC), for low-cost current-steering digital-to-analog converter (DAC) design is proposed. The proposed RTC method exhibits randomized starting-element selection, consecutive-element selection, and low-element switching activity. It can be used to significantly suppress the harmonic distortion caused by a large mismatch of small-area transistors, and, thus, very low cost DACs can be realized. With the proposed RTC, a 14-bit current-steering DAC is implemented in a 1P6M 0.18-μm 1.8-V CMOS process. The measured spurious-free dynamic range (SFDR) exceeds 80 dB. The measurement results showed that RTC improves the SFDR by more than 16 dB. The DAC has an active area of less than 0.28 mm2. The proposed DAC achieves a smaller active area than state-of-the-art 12- to 14-bit DACs.
AB - A dynamic element-matching (DEM) method, i.e., randomized thermometer coding (RTC), for low-cost current-steering digital-to-analog converter (DAC) design is proposed. The proposed RTC method exhibits randomized starting-element selection, consecutive-element selection, and low-element switching activity. It can be used to significantly suppress the harmonic distortion caused by a large mismatch of small-area transistors, and, thus, very low cost DACs can be realized. With the proposed RTC, a 14-bit current-steering DAC is implemented in a 1P6M 0.18-μm 1.8-V CMOS process. The measured spurious-free dynamic range (SFDR) exceeds 80 dB. The measurement results showed that RTC improves the SFDR by more than 16 dB. The DAC has an active area of less than 0.28 mm2. The proposed DAC achieves a smaller active area than state-of-the-art 12- to 14-bit DACs.
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U2 - 10.1109/TCSII.2008.2011606
DO - 10.1109/TCSII.2008.2011606
M3 - Article
AN - SCOPUS:62849105799
SN - 1549-7747
VL - 56
SP - 137
EP - 141
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
IS - 2
ER -