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A 3GS/s 12-bit Current-Steering Digital-to-Analog Converter (DAC) in 55 nm CMOS Technology

1
Institute of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China
2
School of Microelectronics, University of Chinese Academy of Sciences, Beijing 100049, China
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 464; https://doi.org/10.3390/electronics8040464
Received: 19 March 2019 / Revised: 17 April 2019 / Accepted: 23 April 2019 / Published: 25 April 2019
(This article belongs to the Section Semiconductors and Quantum)
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Abstract

A 3GS/s 12-bit current-steering digital-to-analog converter (DAC) fabricated in 55 nm complementary metal–oxide–semiconductor (CMOS) technology has been presented. A partial randomization dynamic element matching (PRDEM) method based on switching sequence optimization is proposed to mitigate the mismatch effect and suppress the harmonic distortion with low hardware complexity. In the switching current cell, the cascode structure together with “always-ON” small current sources are used to keep the output impedance high and uniform. A compact layout of the switching current array is carefully designed, featuring short wires routing and small parasitic capacitance. According to the measured results at 3GS/s, this DAC demonstrates a spurious-free dynamic range (SFDR) of 74.64 dBc at low frequency and 50 dBc at 1.5 GHz output. The chip occupies an active area of 0.2 × 0.48 mm2 and consumes a total power of 495 mW. View Full-Text
Keywords: digital-to-analog converter (DAC); spurious-free dynamic range (SFDR); current-steering; partial randomization dynamic element matching (PRDEM); switching sequence optimization; “always-ON” current source digital-to-analog converter (DAC); spurious-free dynamic range (SFDR); current-steering; partial randomization dynamic element matching (PRDEM); switching sequence optimization; “always-ON” current source
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wang, D.; Guo, X.; Zhou, L.; Wu, D.; Luan, J.; Liu, H.; Wu, J.; Liu, X. A 3GS/s 12-bit Current-Steering Digital-to-Analog Converter (DAC) in 55 nm CMOS Technology. Electronics 2019, 8, 464.

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