Name
Title | ||
|---|---|---|
A low-power column-parallel cyclic ADC for CMOS image sensor with capacitance and current scaling |
Abstract | ||
|---|---|---|
This paper presents a power-optimized column-parallel cyclic ADC for CMOS image sensor readout circuits. By separating the capacitor and bias current source and floating them in the circuit, the multiplying digital-to-analog converter (MDAC)'s capacitive load and bias current can be significantly decreased during least significant bit (LSB) quantization, which allows the ADC to reduce power consumption while maintaining a constant conversion rate. The residual quantization characteristic of MDAC makes the input-referred noise produced in LSB quantization relatively small, so the additional noise generated by capacitance scaling can be compensated by increasing the capacitance load of the most significant bit (MSB). A 14-bit two-stage column-parallel cyclic ADC is designed using 0.13-μm technology. The simulation results show that the effective-number-of-bit (ENOB) is 13.54 bit under 0.96-μs sampling rate, and the power consumption of each column is 631 μW. Compared with the traditional structure, the power consumption of ADC is reduced by 35.1%, while the performance remains unchanged. |
Year | DOI | Venue |
|---|---|---|
2020 | 10.1016/j.mejo.2020.104908 | Microelectronics Journal |
Keywords | DocType | Volume |
Column-parallel ADC,Cyclic ADC,CMOS image sensor,Low power | Journal | 105 |
ISSN | Citations | PageRank |
0026-2692 | 0 | 0.34 |
References | Authors | |
0 | 3 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Jianian Zhu | 1 | 0 | 0.34 |
| Jiangtao Xu | 2 | 74 | 18.98 |
| Kaiming Nie | 3 | 35 | 8.77 |