A Low Power Fully Differential Level-Crossing ADC With Low Power Charge Redistribution Input for Biomedical Applications
| Autor: | Shahin Jafarabadi Ashtiani, Behnam Yazdani |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | IEEE Transactions on Circuits and Systems II: Express Briefs. 69:864-868 |
| ISSN: | 1558-3791 1549-7747 |
| DOI: | 10.1109/tcsii.2021.3127279 |
| Popis: | A low-power fully differential level-crossing analog-to-digital converter (LC-ADC) for biomedical applications is presented. Different from conventional ADCs based on the uniform sampling rate, LC-ADC generates fewer samples for biomedical signals and leads to less power consumption in the following blocks. In this design, the power consumption of n-bit DAC and digital parts is reduced significantly with respect to the conventional LC-ADCs. The proposed method uses a charge redistribution block (CRB) instead of the n-bit DAC, which leads to a large reduction in average switching energy. Besides energy-saving, the proposed switching scheme also reduces the complexity of the controlling logic circuit, providing reduced complexity and low power consumption. Another advantage of the proposed LC-ADC is its fully differential structure. As a result, SNDR is improved by decreasing the levels of even harmonics. The proposed LC-ADC is designed in 0.18 um CMOS technology. Post-layout simulation results show an effective number of bits (ENOB) of up to 6.8 bits with about 97-188 nW power consumption under 0.8 V supply voltage and input signal bandwidth from 1 Hz to 4 kHz. The ADC occupies a silicon area of only 60×65 μm2. |
| Databáze: | OpenAIRE |
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