IO Port Research Articles

Design of Passive Transmission Line by Adjusting Intrinsic Parameters of Josephson Junctions

Along with the improvement of integration and the requirement of high-speed operation, the passive transmission line (PTL) plays a significant role in superconducting integrated circuits due to its intrinsic advantage of extremely low propagation delay and low signal loss in long-distance transmission. Good impedance matching is critical to reduce the signal reflection in the transmission line and maximize the power transferred. Based on the PTL wiring layer selection under SIMIT-Nb03 process, we studied the equivalent input/output impedance for Josephson junction (JJ) at the IO port and explored a method of impedance matching in rapid-single-flux-quantum (RSFQ) circuits by adjusting the Stewart McCumber parameter <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\beta_c$</tex-math></inline-formula> of the JJ in the design of the PTL's driver and receiver. Furthermore, the accompanying influence from the JJ's modified <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\beta_c$</tex-math></inline-formula> on the performance of the driver and receiver is evaluated to maximize the profit of the functional circuits. The common-used serial resistor is removed to obtain a balanced bias margin for the PTL circuits. The proposed PTL has been designed and tested based on SIMIT-Nb03 fabrication process. ±30% bias margin for the PTL is achieved at low frequency and high frequency (40 GHz) contrast tests, including operation speed and transmission length as test vector. Additionally, a frequency sweep for 1 mm PTL is performed by the designed ring oscillator on the chip. The maximum working frequency is up to 129 GHz, with a margin duration of 8%.

Design of an Intelligent Inspection Robot for Underwater Pipelines

This paper will introduce the design of an intelligent inspection robot for underwater pipelines. The whole device is divided into detection module, control module, drive module and housing. Among them, the detection module is the camera and the head, the control module is mainly the Raspberry Pi motherboard, the drive module includes the battery, motor, motor driver. The device through the camera module feedback to the Raspberry Pi to make decisions, and this decision through the IO port output, and then through the motor drive module to drive the motor, the motor to make speed and direction of adjustment. This device is proposed to use stepper motor for robot movement method.

Design of Treatment System for Poor Peripheral Circulation Using Air Wave Pressure Based on STM32 Microprocessor

This study designs an intermittent pneumatic pressurization device with STM32 series single chip as the core. The working state of the air pump and the plurality of air chambers is controlled by the IO port of the single chip microcomputer, and the circulating inflation of the plurality of air bags is realized. The pressure monitoring system consists of a silicon piezoresistive pressure sensor, a high-precision operational amplifier and a 12-bit AD converter which monitors the gas pressure of each gas path in real time to ensure the safety of the equipment. The system is easy to operate, simple in function, and has strong practicability.

Municipal Landfill Leachate Real-time Processing Measurement and Control Method

Landfill leachate is one of the main sources of stench in refuse transfer stations, and it is also one of the main pollution sources in municipal waste water pipe network. This paper designs an automatic treatment and process control system for landfill leachate based on plasma to realize real-time monitoring and automatic control of multiple parameters in the process of landfill leachate treatment. The whole system is divided into two parts: on-site control and remote control. remote control: single-chip microcomputer collects signals of each sensor, communicates with wifi module through serial port, and PC logs into internet of things cloud platform to realize real-time monitoring. The single-chip microcomputer remotely controls the external execution module through the wifi module. Field control: taking the data detected by turbidity and dissolved oxygen sensors as input of fuzzy control, establishing a correct fuzzy rule base and obtaining a fuzzy output set; IO port communication is carried out between PLC and single-chip microcomputer to read the result of fuzzy control operation of single-chip microcomputer and intelligently control the external executing mechanism. Finally realize the function of man-machine interaction.

DsPICマイコンを用いたディジタル信号処理実験の試み

In our college, Department of Electrical Engineering and Information Science focuses on the education for electronics engineers, therefore we have continuously improved student experiments by the method of small groups experiment. The student experiences the input and output using the general-purpose IO port, serial communication by UART and LCD indication with dsPIC. Therefore we introduced an engineering experiment processing the real-time digital signal with the microcomputer for the purpose of understanding digital signal processing still more. In this study, we report the result of the attempts to digital signal processing using the dsPIC micro processor.

A Novel Radiation Hardened Parallel IO Port for Highly Reliable Digital IC Design

A Novel Radiation Hardened Parallel IO Port for Highly Reliable Digital IC Design

Research on the fault diagnosis technology of intermittent connection failure belonging to FPGA solder-joints in BGA package

A new method to detect intermittent faults in FPGA (field programmable gate array) of BGA (ball grid array) packages is presented. Inject proper current into measured IO port via sensor circuit, the intermittent faults will arouse impedance of the solder-joint to change intermittently, the voltage of solder-joint will also change intermittently, the fault information can be obtained through regulating the voltage signal. Compared with current monitoring method based on degradation model, this scheme is more reliable and accurate. It can prevent the catastrophic faults caused by failure of the FPGA solder-joints effectively, as well as economize the maintenance cost.

Effective Utilization of a Microcontroller Port for Optimisation of Hardware

In embedded systems microcontrollers play a very important role because modern day's microcontrollers have inbuilt program as well as data memory of enough length to implement any embedded application without need of any external memory. But it has limited number of IO port pins to interface IO peripherals and better utilization of these IO port pins becomes extremely challenging.

Integrated design of workcells and unidirectional flowpath layout

In manufacturing cells layout design with a unidirectional flow system, the accurate distance between two workcells can be uncovered with both the determination of IO port locations after the layout design of the cell with its orientation and the unidirectional flowpath layout design. This paper presents the method to obtain a global solution for manufacturing workcells and unidirectional flowpath layout design (ICFLD) with consideration of IO ports of workcells. The flow distance between two workcells is calculated from output port of one workcell to input port of the other workcell through the unidirectional flowpath layout. A zero-one integer programming model is developed for the ICFLD problem. And a heuristic algorithm for the ICFLD problem is developed by decomposing the ICFLD problem into two subproblems and iteratively and alternately solving the decomposed subproblems. Computational experiments are performed and its results are analyzed.

Design and Development of a Small Stereovision Sensor Module for Small Self-Contained Autonomous Robots

We designed a small stereovision (SSV) sensor module for easily adding visual functions to a small robot and enabling their use. The SSV sensor module concept includes 1) a vision sensor module containing a camera and a visual processor and 2) connecting to a robot system through general-purpose interface. This design enables the use of visual functions as ordinary sensors such, as touch or ultra-sonic sensors, by simply connecting a general-purpose interface port such as an IO port or serial connector. We developed a prototype module with small CMOS image sensors for a mobile phone and a 16 bit microprocessor. The 30×40mm prototype is small enough to attach even to palm-top robots. Our module demonstrates image processing including binarization, color extraction and labeling, and template matching. We developed self-contained robots, including a 2DOF head robot, a humanoid robot, and a palm-top robot, and realized vision-based autonomous behavior.