Name
Title | ||
|---|---|---|
A 91.0-dB SFDR Single-Coarse Dual-Fine Pipelined-SAR ADC With Split-Based Background Calibration in 28-nm CMOS |
Abstract | ||
|---|---|---|
This paper presents a single-coarse dual-fine architecture that improves energy-efficiency of pipelined-SAR analog-to-digital converters (ADCs). A coarse and fast sub-ADC is used to quantize the most significant bits (MSBs), which are encoded with a proposed residue transformation method to control the residue generation of the first stages in two fine channels. The residue voltages generate on the capacitive digital-to-analog converters (C-DACs) of split fine channels directly without successive approximation processes. Therefore, the conversion rate is increased and the power is reduced. A shuffle mechanism is introduced into split-ADC based digital background calibration to avoid the divergence of the conventional algorithm in the proposed architecture. A high-energy-efficiency dynamic amplifier is also introduced as the residue amplifier. A 14-bit 60-MS/s ADC is prototyped in a 28-nm CMOS process. The digital calibration engine operates under 0.9-V supply, other parts of the ADC core operate under 1.05-V supply. The ADC core consumes 4.26 mW. Measurement results show that the calibration improved the signal-to-noise and distortion ratio (SNDR) and spur-free dynamic range (SFDR) dramatically, the calibrated ADC achieves SNDR and SFDR of 66.9 dB and of 91.0 dB respectively, translating to a Schreier FoM of 165.4 dB and a Walden FoM of 39.3 fJ/conversion-step. |
Year | DOI | Venue |
|---|---|---|
2021 | 10.1109/TCSI.2020.3037295 | IEEE Transactions on Circuits and Systems I: Regular Papers |
Keywords | DocType | Volume |
Coarse-fine ADC,digital calibration,dynamic amplifier,pipelined-SAR ADC,split-ADC | Journal | 68 |
Issue | ISSN | Citations |
2 | 1549-8328 | 1 |
PageRank | References | Authors |
0.36 | 0 | 8 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Yuefeng Cao | 1 | 1 | 0.36 |
| Shumin Zhang | 2 | 3 | 1.15 |
| Tianli Zhang | 3 | 3 | 1.15 |
| Yongzhen Chen | 4 | 3 | 4.82 |
| Yutong Zhao | 5 | 1 | 2.05 |
| Chixiao Chen | 6 | 6 | 4.36 |
| Fan Ye | 7 | 63 | 21.55 |
| Junyan Ren | 8 | 154 | 41.40 |