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Demystifying and Mitigating Code-Dependent Switching Distortions in Current-Steering DACs.
- Source :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers; Jan2019, Vol. 66 Issue 1, p68-81, 14p
- Publication Year :
- 2019
-
Abstract
- This paper analyzes the intermodulation between the element transition rate and the output-dependent unit switching distortion, i.e., the switching distortion of one switching unit, in current-steering digital-to-analog converters (DACs). The analysis and experimental results reveal how this intermodulation affects the DAC linearity. Based on this, we also propose a technique, termed random pairwise swapping (RPS) to improve the linearity of dynamic-element-matching-decoded DACs. Compared with existing techniques, RPS needs no half-cycle RZ operations and, thus, has no related vulnerabilities. In addition, the RPS could deal with the mismatch between different channels effectively. A 14-bit experimental DAC is fabricated in a 65-nm CMOS process. Measured results at 1.0-GS/s show above 72-dBc SFDR within 422-MHz bandwidth and 8–10-dB image tone suppression by the proposed RPS technique. At 3.0 GS/s, the SFDR is over 60 dBc within 600-MHz bandwidth. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 66
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 133501397
- Full Text :
- https://doi.org/10.1109/TCSI.2018.2866819