| 고형호 교수_Low-Noise Chopper-Stabilized Zero-Drift Amplifier With SAR-Assisted Automatic Offset Calibration Loop | |||||
| 분류 | 논문 | 작성자 | 미래국방지능형ICT교육연구단 | ||
|---|---|---|---|---|---|
| 조회수 | 179 | 등록일 | 2024.02.15 | ||
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IEEE Access Low-Noise Chopper-Stabilized Zero-Drift Amplifier With SAR-Assisted Automatic Offset Calibration Loop GIBAE NAM, GYURI CHOI, MOOKYOUNG YOO, SANGGYUN KANG, BYEONGKWAN JIN, HYEOKTAE SON, KYOUNGHWAN KIM, JIHYANG WI, SEUNGMIN AHN, HYOUNGHO KO Abstract This paper presents a low-noise chopper-stabilized zero-drift amplifier with successive approximation register (SAR)-assisted automatic offset calibration loop (AOCL). The amplifier is designed using multipath zero-drift architecture including a low frequency path (LFP) and a high frequency path (HFP). The multipath architecture can achieve the low offset, the low noise and the low drift while maintaining the wide bandwidth. The LFP amplifier exploits a chopper scheme to reduce the offset and the low-frequency noise components. The digitally assisted AOCLs in the LFP and the HFP using SAR and current-mode digital-to-analog converter (DAC) can reduce the offset coarsely. The mismatch and the offset of the LFP amplifier can generate the up-modulated output ripples. The residual ripples in the LFP can be reduced using a ripple reduction loop (RRL). To prevent secondary ripple caused by the offset of the RRL itself, an auto-zero (AZ) integrator is employed. The HFP amplifier is designed using the folded-cascode structure with class-AB output stage to enhance the power efficiency. The multipath amplifier is fabricated in a 0.18 µm CMOS process. The current consumption, supply voltage and active area are 130 µA, 1.8 V and 0.86 mm2 , respectively. The amplifier has a unit gain bandwidth (UGBW) of 0.875 MHz, an input referred offset of 4.6 µV, an input referred noise of 25.6 nV/√ Hz, an offset drift of 53 nV/◦C and a noise efficiency factor (NEF) of 11.2. https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9686713 |
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