Design Of Detection Circuit Research Articles

A Dynamic Concentration-Dependent Analytical I,–V Model for LG-GFET Biosensor

In the past few years, liquid-gated graphene field-effect transistors (LG-GFETs) have been widely used in biological detection due to their unique advantages. An accurate transistor model is the basis of biological detection circuit design, however, the reported GFET models are mainly focusing on solid-gated GFETs. Therefore, it is essential to conduct the research on LG-GFET model. In this article, an improved <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\textit{I}$</tex-math> </inline-formula> – <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\textit{V}$</tex-math> </inline-formula> model of LG-GFET is presented based on Fregonese’s model. An improved electric double-layer capacitor model is proposed for LG-GFET. Then, the relationship among iron concentration, bias voltages, and current is studied comprehensively. Furthermore, the drain current response change with time is taken into account and the dynamic concentration-dependent model is established. To verify the accuracy of the proposed model, LG-GFET is simulated in TCAD software and fabricated to perform the measurement. The simulation results and measurement results are compared with the model results, respectively. These results show that the relative root-mean-square error (RMSE) to both simulation and measurement results is less than 5.7%. It is revealed that the proposed model can be applied to biological detection and achieve high accuracy.

Hardware design of PMSM control system based on DSP

Compared with traditional motor, permanent magnet synchronous motor has the characteristics of strong anti-interference ability, high starting torque and power density, and good speed regulation performance.Permanent magnet synchronous motor servo system has become a research hotspot in the field of servo drive.In this paper, with DSP28335 as the main control chip to give a permanent magnet synchronous motor AC servo control hardware system design scheme, the paper introduces in detail the system core control circuit, main power circuit, detection circuit design and the choice of main components.The hardware system designed has been applied to engineering practice, and has achieved good control effect.

An Identification Method for Rotor Direction Based on Charge Induction.

The detection of rotor motion is always key to ensure the normal operation of industrial sewing machines. This paper presents a novel method for rotor detection based on charge induction mechanism, which is suitable for industrial environments with high noise and electromagnetic radiation and is easy to install. Firstly, the principle of measuring rotor rotation based on charge induction is given. Then, the detection model of rotor direction identification based on two detection electrodes is established. Finally, details are given of the detection circuit design and the experiment that was carried out. The results show that the proposed method can effectively identify the noncontact rotor direction with and without occlusion, indicating that the method has excellent anti-interference capability. The accuracy of the method can be further improved by increasing the sampling rate and sampling points of the system.

Design of Automobile Brake Lamp Fault Automatic Detection Circuit

It is easy to have traffic accidents such as rear-ended due to automobile brake lamp failure. In order to solve this problem, we design a kind of auto detection circuit of brake lamp fault which uses current detection chip ACS712. The circuit applies Holzer induction to transform the current signal change into voltage change, and judges whether the brake lamp is damaged through the voltage comparison circuit. This circuit is simple, and fault display can be installed in the instrument panel. The design of detection circuit can accurately and reliably light alarm lamp, remind the driver timely maintenance, and effectively avoid unnecessary collision accident.

Fault Detection Circuit Based on IGBT Gate Signal

The detection circuit presented in this paper has the purpose of detecting short circuit and open circuit faults in insulated gate devices (IGBT). The detection circuit design is based on the analysis of the IGBT gate signal VGE, which is characterized by carrying out the fault detection within the IGBT switching times under test. The fast fault detection is due to the following considerations: a) Employing technology components with a high slew rate, allows the detection within the switching times, b) Employing fewer components allow the circuit design less expensive and faster, and This paper presents the experimental validation results for the proposed fault detection cases.

Detection Circuit Design of Lab-on-a-Chip at 340nm Ultraviolet Light Spectrum

In order to satisfy the demand of good performance of detection at 340nm ultraviolet light Spectrum, the author design a preamplifier circuit of photoelectric detector. Moreover, through theoretical analysis and computer simulation the author also propose a universal method of the designation of photoelectric detector’s preamplifier which can make the circuit we design satisfy the demand of stability and high speed. In the end, the result of experiment proves that the circuit we design can meet the detection of 340nm ultraviolet light spectrum fairly well and achieve a fairly high precision.

Circuit Design of Surface Acoustic Wave Based Micro Force Sensor

Pressure sensors are commonly used in industrial production and mechanical system. However, resistance strain, piezoresistive sensor, and ceramic capacitive pressure sensors possess limitations, especially in micro force measurement. A surface acoustic wave (SAW) based micro force sensor is designed in this paper, which is based on the theories of wavelet transform, SAW detection, and pierce oscillator circuits. Using lithium niobate as the basal material, a mathematical model is established to analyze the frequency, and a peripheral circuit is designed to measure the micro force. The SAW based micro force sensor is tested to show the reasonable design of detection circuit and the stability of frequency and amplitude.