低噪声线性霍尔传感器读出电路设计
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摘要
基于斩波技术和旋转电流技术,设计了一款低噪声、高精度的线性霍尔传感器读出电路。在传统斩波仪表放大器的基础上,引入开关电容陷波滤波器和PTAT(Proportional To Absolute Temperature)电流补偿技术,实现了低纹波、低噪声和低温漂。采用SMIC 0.18μm CMOS工艺,在电源电压为3.6V,斩波频率为250kHz下,对所设计的电路进行仿真验证。通过Spectre仿真,电路-3dB带宽为11.5kHz,纹波抑制比为39.6dB,输入等效参考噪声功率谱密度PSD为15.4nV/√Hz,非线性均在0.5%以内,整体电路能在-40℃至150℃温度范围内精确而稳定的工作。
Based on chopping technology and spinning-current technology, a low noise, high precision linear Hall sensor readout circuit is designed. Based on the traditional chopper instrumentation amplifier, the switched capacitor notch filter and PTAT(Proportional To Absolute Temperature)current compensation technology are introduced to achieve low ripple, low noise and low temperature drift. The SMIC 0.18μm CMOS process was used to verify the designed circuit at a power supply voltage of 3.6 V and a chopping frequency of 250 kHz. Through Spectre simulation, the circuit has a-3 dB bandwidth of 11.5 kHz, the ripple rejection ratio of 39.6 dB, the input-referred noise power spectral density(PSD)of 15.4 nV/√Hz,and the non-linearity is within 0.5%. The overall circuit can operate accurately and stably over the temperature range of-40 ℃ to 150℃.
Based on chopping technology and spinning-current technology, a low noise, high precision linear Hall sensor readout circuit is designed. Based on the traditional chopper instrumentation amplifier, the switched capacitor notch filter and PTAT(Proportional To Absolute Temperature)current compensation technology are introduced to achieve low ripple, low noise and low temperature drift. The SMIC 0.18μm CMOS process was used to verify the designed circuit at a power supply voltage of 3.6 V and a chopping frequency of 250 kHz. Through Spectre simulation, the circuit has a-3 dB bandwidth of 11.5 kHz, the ripple rejection ratio of 39.6 dB, the input-referred noise power spectral density(PSD)of 15.4 nV/√Hz,and the non-linearity is within 0.5%. The overall circuit can operate accurately and stably over the temperature range of-40 ℃ to 150℃.
引文
[1]蔡明,章英,白雪莲,等.线性霍尔传感器技术及其在气动定位控制中的应用[J].仪表技术与传感器,2013, 8(1):13-15.
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[3] Witte D J F, Makinwa K A A, Huijsing J H. Dynamic Offset Compensated CMOS Amplifiers[M]. Netherlands:Springer, 2009.
[4]滕谋艳.使用PTAT电流补偿的基准电流源[J].科技视界, 2014,15(33):106-106.
[5] Jiang J, Makinwa K A A. Multipath Wide-Bandwidth CMOS Magnetic Sensors[J]. IEEE Journal of Solid-State Circuits, 2017, 52(1):198-209.
[6] PopoviC'R S. Hall-effect devices[J]. Sensors&Actuators, 1989, 17(1):39-53.
[7] Jiang J, Kindt W J, Makinwa K A A. A Continuous-Time Ripple Reduction Technique for Spinning-Current Hall Sensors[J]. Solid-State Circuits,IEEE Journal of, 2014, 49(7):1525-1534.
[8] Burt R, Zhang J. A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path[J]. IEEE Journal of Solid-State Circuits,2006, 41(12):2729-2736.
[2] Wu R, Huijsing J H, Makinwa K A A. Precision Instrumentation Amplifiers and Read-Out Integrated Circuits[M]. New York:Springer, 2013.
[3] Witte D J F, Makinwa K A A, Huijsing J H. Dynamic Offset Compensated CMOS Amplifiers[M]. Netherlands:Springer, 2009.
[4]滕谋艳.使用PTAT电流补偿的基准电流源[J].科技视界, 2014,15(33):106-106.
[5] Jiang J, Makinwa K A A. Multipath Wide-Bandwidth CMOS Magnetic Sensors[J]. IEEE Journal of Solid-State Circuits, 2017, 52(1):198-209.
[6] PopoviC'R S. Hall-effect devices[J]. Sensors&Actuators, 1989, 17(1):39-53.
[7] Jiang J, Kindt W J, Makinwa K A A. A Continuous-Time Ripple Reduction Technique for Spinning-Current Hall Sensors[J]. Solid-State Circuits,IEEE Journal of, 2014, 49(7):1525-1534.
[8] Burt R, Zhang J. A Micropower Chopper-Stabilized Operational Amplifier Using a SC Notch Filter With Synchronous Integration Inside the Continuous-Time Signal Path[J]. IEEE Journal of Solid-State Circuits,2006, 41(12):2729-2736.