Dual-Path and Dual-Chopper Amplifier Signal Conditioning Circuit With Improved SNR and Ultra-Low Power Consumption for MEMS

Vejdani, Parisa; Nabki, Frédéric

doi:10.1109/tcsi.2019.2893861

Cited by 7 publications

(2 citation statements)

References 24 publications

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“…Nonetheless, this approach is only practical when FN dominates the system resolution. A popular approach to decreasing FN is to shift its spectrum outside of the frequency range of interest by using chopper stabilization [3]- [7]. However, due to the frequency adaptation process, this method is subject to parasitic offsets and harmonic distortions.…”

Section: Introductionmentioning

confidence: 99%

A Novel Current Density Based Design Approach of Low-Noise Amplifiers

Tarkhan

2022

IEEE Access

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The input-referred noise (IRN) is one of the most crucial performance indicators for analog front-ends (AFEs) of neural recording devices. We present in this paper, a novel design approach for a low-noise amplifier (LNA) based on the transistor optimization method in CMOS technology. Because flicker noise is predominant in neural recording applications, the AFE has been designed so as to meet input-referred flicker noise specifications, whereas thermal noise contributions are monitored and controlled by flicker noise corner frequencies. Transistor optimization is accomplished by using a lookup table that encapsulates its performance based on its current density. Initially, transistors are optimized based on flicker noise performance; later, they may be further optimized based on their size, power consumption, transconductance, or thermal noise contribution. The proposed approach has been validated by designing a folded-cascode amplifier with an IRN ranging from 2 to 8 µV rms . The results of the simulation show that the errors of our design methodology are less than 10%, which is less than those of gm /I D and the inversion coefficient methods. The proposed LNA achieves 2.1 µV rms while consuming 0.83 µW from 1.2 V supply.

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Section: Introductionmentioning

confidence: 99%

A Novel Current Density Based Design Approach of Low-Noise Amplifiers

Tarkhan

2022

IEEE Access

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“…In this paper, a clock scheme named "multi-nested clocks" is proposed to solve this problem. Compared with the traditional charge injection reduction methods such as the dummy switch [17][18], the injection-nulling switch [19], the low swing driver [20] and the multi-frequency operation [21], the proposed method can not only reduce the charge injection, but also reduce the charge injection variation, thus improve the precision of readout circuit.…”

mentioning

confidence: 99%

Precision Improvement of Power-Efficient Capacitive Senor Readout Circuit Using Multi-Nested Clocks

Zhong

Lai

et al. 2020

IEEE Trans. Circuits Syst. I

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This paper proposes a clock strategy to improve the precision of power-efficient readout circuit for capacitive sensor. To achieve high power efficiency, capacitive sensor such as MEMS accelerometer is designed with open-loop architecture rather than close-loop one. In the open-loop architecture, the capacitance variation of sensing element is limited to femto-farad level in order to overcome nonlinearity problem. However, due to this limitation, the signal charge from sensing element is weak and the interference charge due to coupling capacitance between clock wires and sensing electrodes becomes a significant issue. Therefore, split clock bus is employed to meet this challenge, but the split clock bus introduces the timing mismatch problem which causes charge injection sensitive to fabrication process and circuit operating voltage. As a result, the offset variation and nonlinearity of readout circuit will increase, and this will lead to reduction of precision. In this work, a clock scheme named "multi-nested clocks" is proposed to address the charge injection problem due to timing mismatch. The multi-nested clocks are demonstrated in a readout circuit fabricated using a 0.18-μm BCD process. The measurement results show that compared to the readout circuit using traditional clock, the readout circuit using the multi-nested clocks reduces the equivalent input offset from 1.66fF to 0.25fF, the offset variation from 1.4fF to 0.2fF and the nonlinearity from 5.5% to 0.9%.

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Wearable micro‐electro‐mechanical systems pressure sensors in health care: Advancements and trends—A review

Kiran Kolluri,

Ananiah Durai

2024

IET Wireless Sensor Systems

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Wearable technologies offer a complementary approach to clinical diagnostics by utilising a variety of physical, chemical, and biological sensors to mine physiological (biophysical and/or biochemical) data in real time (preferably continuous), in a non‐intrusive or minimally invasive manner. Micro‐Electro‐Mechanical Systems (MEMS) pressure sensors dominate the healthcare applications especially for vital parameter sensing, as they feature the non‐invasive method of diagnosis and have comparatively high sensitivity leading to better accuracy. Among them, capacitive and piezoresistive type pressure sensors have gained substantial advantages compared to other transduction devices due to high linearity, low power consumption, and low thermal coefficient. The performance review of such MEMS sensors in research and as well as market‐ready devices that can be seamlessly integrated into commercial wearable products is the primary focus in this work. Challenges in the system level integration of Microsensors with the associated interface electronics and the design mitigation of such MEMS microsystems are also discussed. Design insights of analog front‐end circuitry in terms of gain, noise, power and area that are crucial for any wearable applications are also comprehensively reviewed.

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Dual-Path and Dual-Chopper Amplifier Signal Conditioning Circuit With Improved SNR and Ultra-Low Power Consumption for MEMS

Cited by 7 publications

References 24 publications

A Novel Current Density Based Design Approach of Low-Noise Amplifiers

A Novel Current Density Based Design Approach of Low-Noise Amplifiers

Precision Improvement of Power-Efficient Capacitive Senor Readout Circuit Using Multi-Nested Clocks

Wearable micro‐electro‐mechanical systems pressure sensors in health care: Advancements and trends—A review

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