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- Title
Study of Split Capacitor DAC Mismatch and Calibration in SAR-ADC.
- Authors
Zhang, Yun; Zhao, Yiqiang; Dai, Peng
- Abstract
Mismatch and parasitic effects of bridge capacitors in successive-approximation-register analog-to-digital converter's (SAR-ADC) split capacitor digital-to-analog conversion (DAC) cause a significant performance deterioration. This paper presents a nonlinearity analysis based on an analytical model, and a modified calibration method utilizing a pre-bias bridge capacitor is accordingly proposed. The proposed method, which uses three-segment split capacitor DAC structure, can effectively eliminate over-calibration error caused by conventional structure. To verify the technique, a 14-bit SAR-ADC has been designed in 0.35-m 2P4M CMOS process with the PIP capacitor, and the simulation results show the method can further improve ADC performance.
- Subjects
CAPACITORS; DIGITAL-to-analog conversion; SUCCESSIVE approximation analog-to-digital converters; COMPLEMENTARY metal oxide semiconductors; NONLINEAR theories
- Publication
Journal of Circuits, Systems & Computers, 2017, Vol 26, Issue 1, p1
- ISSN
0218-1266
- Publication type
Article
- DOI
10.1142/S0218126617500037