MEMS capacitive accelerometer for the Internet of Things (IoT) applications is designed with open-loop structure rather than close-loop to achieve low power consumption. In structure, voltage control readout technique preferred cost. However, suffers from poor noise performance and efficiency (in terms FoM). this paper, weak feedback oversampling successive approximation circuit which merges closed-loop hybrid dynamic amplifier reduction proposed floor, high accuracy. The WFB-OSA based...

This paper proposed an oversampling successive approximation (OSSA) technique to build switched-capacitor capacitance-to-voltage convertor (SC-CVC) for readout circuit of MEMS differential capacitive sensor. The employing the OSSA has significantly improved resistance common-mode parasitic capacitance input terminal circuit. In circuit, there are five main non-ideal characteristics: holding error, recovery degradation, increment rise-edge and charge injection which reduce accuracy settling...

The bandwidth-enhanced oversampling successive approximation (BE-OSA) readout technique is proposed in this article to reduce the noise floor of circuit for micro-electromechanical systems (MEMS) capacitive accelerometer while achieving high power efficiency terms figure merit (FoM). open-loop structure has been widely used MEMS Internet Things (IoT) applications due its low consumption. However, accelerometer, capacitance variation sensing element limited femto-farad level overcome...

MEMS capacitive accelerometer for the Internet of things applications is designed with open-loop structure rather than close-loop to achieve low power consumption. In structure, voltage control readout instead charge preferred cost. However, suffers from efficiency (in terms <i>FoM</i>) due significant parasitic-capacitance-induced noise. this paper, correlated double amplifying (CDA) technique proposed reduce noise circuit high efficiency. Although, traditional sampling (CDS) can also be...

MEMS capacitive accelerometer for the Internet of Things (IoT) applications is designed with open-loop structure rather than closed-loop to achieve low power consumption. In structure, voltage control readout technique preferred cost. However, suffers from dynamic range and efficiency (in terms <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mathbf {FoM}$ </tex-math></inline-formula> ). this paper,...

Saxitoxin (STX) is one of the paralytic shellfish poisons (PSP) that endanger people's health. It necessary to develop methods for on-site rapid detection STX in order prevent safety accidents. An enzyme-linked immunosorbent assay (ELISA) timesaving and effective, but it not suitable large-scale in-field tests due expensiveness commercial ELISA kits bulkiness a microtiter plate reader (MTPR). In this study, portable smartphone-based colorimetric analyzer (SBCA) with cost-effictive enhanced...

This article presents a single-loop third-order discrete-time delta-sigma modulator (DTDSM) with 4-bit second-order noise shaping successive approximation register (NS SAR) quantizer. To realize an aggressive transfer function (NTF), novel Finite Impulse Response (FIR) filter is embedded in the NS SAR. As employing flipped voltage follower (FVF), which offers unity gain instead of open loop dynamic amplifier, proposed FIR sharp and insensitive to process, voltage, temperature (PVT)...

This paper proposes a novel method to reduce the water interference on touch panel based mutual-capacitance sensing in human finger detection. As height of (height >10 mm) is far larger than that water-drop <;1 mm), if density distribution electrical field panel's cell high high-height space and low low-height can be designed distinguish from water-drop. To achieve this field, mutual-coupling shaping (MEFS) technique employed build cell. The drawback MEFS large parasitic capacitance, which...

A low-noise instrumentation amplifier for bio-signal recording is proposed in this paper. One of the significant disturbances, electrode DC offset, suppressed using successive-approximation-compensation (SAC) circuit based on a discrete-time servo loop with Chopper DAC Array. Firstly, offset at output quantified SAR quantizer. Next, digital code produced by quantizer used to control chopper array. Finally, suitable compensation voltage generated and directly correct input amplifier. By...

This paper presents a <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$G_{m}$ </tex-math></inline-formula> -C integrator-implanted DC servo loop (GMCI2-DSL) and bulk-driven ripple reduction (BD-RRL) for bio-potential readout analog-front-end (AFE) amplifier. The proposed AFE amplifier employs the GMCI2-DSL BD-RRL to achieve low noise significant total harmonic distortion (THD) with small amplitude. A...

This paper designs a close loop Σ-Δ readout circuit for differential MEMS accelerometer. A technique named oversampling successive approximation (OSA) is employed to build basic amplifiers and integrators. can largely reduce the gain error thus low amplifier such as single stage allowed be used. As result, power consumption chip area are reduced. However, OSA-based integrators vulnerable interference caused by charge injection leakage current from specific MOSFET switches. drawback analyzed...

Micro-electromechanical systems (MEMS) capacitive accelerometer for the Internet of Things (IoT) applications is required to operate at various sampling frequencies while keeping high power efficiency. To meet this requirement, dynamic amplifiers are used in readout circuit accelerometer. However, amplifier's open-loop gain low and varies with frequency circuit. This significantly deteriorates accuracy In article, dynamic-amplifier-specific oversampling successive approximation (DA-OSA)...

In this paper, an improved inductor simulator structure is presented, which can be configured as either grounded or floating with low component count. To achieve simplified structure, circuits are designed using a minimal number of transistors and small capacitance, rather than the complex components/modules such current convey operational trans-conductance amplifier traditionally used. The simulation results based on $$0.5\, \upmu \hbox {m}$$ CMOS process parameters show that proposed able...

This paper proposes a clock strategy to improve the precision of power-efficient readout circuit for capacitive sensor. To achieve high power efficiency, sensor such as MEMS accelerometer is designed with open-loop architecture rather than close-loop one. In architecture, capacitance variation sensing element limited femto-farad level in order overcome nonlinearity problem. However, due this limitation, signal charge from weak and interference coupling between wires electrodes becomes...

MEMS capacitive accelerometers play a fundamental role in wide range of monitoring systems for the Internet Things (IoT) applications. In these applications, sensors are powered by battery, therefore high power-efficiency is required to extend battery life. To promote efficiency design technique, innovation on readout circuit significance. recent years, there has been growing interest developing with specific performances, such as low power consumption and compact area wearable devices,...