Name
Title | ||
|---|---|---|
A 12-b Subranging SAR ADC Using Detect-and-Skip Switching and Mismatch Calibration for Biopotential Sensing Applications |
Abstract | ||
|---|---|---|
This paper presents a 12-b successive approximation register (SAR) analog-to-digital converter (ADC) for biopotential sensing applications. To reduce the digital-to-analog converter (DAC) switching energy of the high-resolution ADC, we combine merged-capacitor-switching (MCS) and detect-and-skip (DAS) methods, successfully embedded in the subranging structure. The proposed method saves 96.7% of switching energy compared to the conventional method. Without an extra burden on the realization of the calibration circuit, we achieve mismatch calibration by reusing the on-chip DAC. The mismatch data are processed in the digital domain to compensate for the nonlinearity caused by the DAC mismatch. The ADC is realized using a 0.18 mu m CMOS process with a core area of 0.7 mm(2). At the sampling rate f(S) = 9 kS/s, the ADC achieves a signal-to-noise ratio and distortion (SINAD) of 67.4 dB. The proposed calibration technique improves the spurious-free dynamic range (SFDR) by 7.2 dB, resulting in 73.5 dB. At an increased f(S) = 200 kS/s, the ADC achieves a SINAD of 65.9 dB and an SFDR of 68.8 dB with a figure-of-merit (FoM) of 13.2 fJ/conversion-step. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.3390/s22093600 | SENSORS |
Keywords | DocType | Volume |
analog-to-digital converter, successive approximation register, signal-to-noise, merged capacitor switching, capacitor mismatch | Journal | 22 |
Issue | ISSN | Citations |
9 | 1424-8220 | 0 |
PageRank | References | Authors |
0.34 | 3 | 3 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Cong Luong Nguyen | 1 | 0 | 0.34 |
| Huu Nhan Phan | 2 | 0 | 0.34 |
| Jong-Wook Lee | 3 | 66 | 11.45 |