An Ultra-Low-Power 16-Bit Second-Order Incremental ADC With SAR-Based Integrator for IoT Sensor Applications
| Autor: | Seong-Kwan Hong, Junbo Shim, Oh-Kyong Kwon, Min-Kyu Kim |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Differential nonlinearity business.industry Amplifier Transconductance 020208 electrical & electronic engineering Electrical engineering 02 engineering and technology law.invention Effective number of bits Capacitor Integral nonlinearity law Integrator Dynamic demand 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering business |
| Zdroj: | IEEE Transactions on Circuits and Systems II: Express Briefs. 65:1899-1903 |
| ISSN: | 1558-3791 1549-7747 |
| Popis: | This brief presents a 16-bit amplifier-free second-order incremental analog-to-digital converter (IADC2) for sensor applications. The proposed IADC2 employs a power efficient successive approximation register (SAR)-based integrator for the charge transfer operation, which consumes dynamic power only, instead of using power-consuming operational transconductance amplifiers that consume a high static current. The proposed amplifier thus achieves ultra-low-power consumption in low-frequency operation. In addition, the charge redistribution period of a capacitor digital-to-analog converter (CDAC) in the SAR-based integrator is split in a time-interleaving way, such that the CDAC can be shared by the first and second integrators. A test chip, including the proposed IADC2, was fabricated using 0.18- ${\mu }\text{m}$ standard CMOS process technology. The measurement results show that the proposed IADC2 achieves a differential nonlinearity of −0.51/+0.74 LSB and an integral nonlinearity of −3.12/+0.24$ LSB. In addition, the measured maximum signal-to-noise ratio, and an effective number of bits are 93.4 dB and 15.22-bit for the dc signal, respectively. The measured power consumption is 0.24 ${\mu }\text{W}$ at a sampling frequency of 10 kHz. Therefore, the proposed IADC2 is suitable for various sensor applications requiring ultra-low-power consumption. |
| Databáze: | OpenAIRE |
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