Search

Increasing demand for DRAM scaling and high-bandwidth has driven DRAM technology to 3D/2.5D integration. With the innovative Hybrid Bonding technology, a new Stacked Embedded DRAM (SEDRAM) architecture was developed on LPDDR4/4X product. In this SEDRAM, a DRAM array wafer and logic wafer were fabricated separately and then face-to-face fusion connected through ultra-high-density, low-resistance Hybrid Bonding. By separating the control, I/O, DFT and periphery circuits to a logic die, SEDRAM offers a novel approach to DRAM product development and accomplishes an extremely high-bandwidth logic-to-memory interface speed of 34GBps per 1Gb with low power consumption as low as 0.88pJ/bit.

Basing on groundwater quality data collected in Beijing and groundwater chemical characteristic, the paper studies the hydrogeochemistry law of groundwater total hardness of Beijing suburb in some methods such as groundwater solute transportation simulation and the geological statistics. Set up hydrogeology conception model, mathematic model and the three-dimensional groundwater total hardness transportation model. At last, the paper forecasts evolution trend of total hardness, which provides the scientific evidence for groundwater management.

This paper describes the wireless communication module NRF905 in the bank application of queuing systems. Describes the system's overall design, a brief introduction NRF905 module hardware features and software programming. Focuses on the realization of wireless communication methods and the development of communication protocols. Also introduced the system hardware design and workflow of each module. The system performed well in actuall use.

In this paper, we propose a new method for solving the Shipborn Weapon System Optimal Configuration (SWSOC) problem. This method mainly divides establishment of the outranking between schemes into two steps. Firstly, local preference indexes are calculated by comparing the sub-attributes of one scheme with another one, and then these index subsets are integrated into binary relation of two schemes. Though this method could add to the computing quantity of decision making, it makes the decision-maker much more clearly about the system, and increases the feasibility of ranking results.

The heat transfer performance of carbon dioxide in a horizontal tube with water in counter flow was experimentally investigated in this paper. The results indicate that the changes of inlet pressure, mass flow rate and cooling water flow rate have major effects on heat transfer performance. The coefficient and heat transfer capacity can be improved by increasing inlet pressure, mass flow rate and cooling water flow rate. The variation of inlet temperature has none effects on heat transfer coefficient. And the heat transfer coefficient of carbon dioxide inside the tube is further greater than that of water outside the tube. Enhancement heat transfer should be adopted in outside

This article introduces a type of embedded single chip network measure and control system based on Ethernet, which adopts high speed single chip with kernel of 8052. Through controlling the special chip for Ethernet, the system realized the function of TCP/IP protocol. Since the system can be used as an independent system, any computer on the net can control the system or transmit order and data to the system through standard TCP/IP protocol. Equipped the system by digital temperature sensor, it can be used to measure industry field temperature and transmit the results to computer through network, and then get temperature curve. And its measure and control range are all -10~+125degC, the accuracy is plusmn1degC, the resolution reaches 0.1degC. This system have many advantages such as simple structure, better universal, communicating through network, flexible usage, low cost etc. It can be adapted by various intelligent sensors and has better expanding ability. It can be used in the fields of powder object temperature measurement remote data acquisition, remote measurement and control and so on.

Sensor or transducers is a kind of important tool for completion of signal collection, and is a device which can feel the physical world of light, pressure, temperature, flow, level, acceleration, force, etc. Then convert this signal into usefulness output signal according to a certain law. The output of some sensors, such as piezoresistive sensor, strain sensor bridge sensor, thermocouple sensor, thermal resistance sensor, angle sensor, accelerometer sensor, humidity sensor, capacitive sensor, piezoelectric sensor etc., is very weak. Its temperature dependence and linearity are worse, and the SNR in the process of transference decrease significantly. For this disadvantage, the signals must be processed before post-processing. It can be realized by the digitally controlled potentiometers. In the fiber receiver, photodiode programmable transimpedance amplifier with digitally controlled potentiometers converts the current into voltage. Using the digitally controlled potentiometers, it can be linear that the characteristic of the platinum thermal resistance temperature sensor (including zero adjustment and full-range adjustment) and fault detect, and it can meet the request of accurate temperature measurement. The digitally controlled potentiometers also can be used in pressure measurement system to calibrate the offset voltage and full-range of the pressure sensor. Finally, the topology with feedback system constituted by digitally controlled potentiometers was provided.

The digitally controlled potentiometer is a kind of new style electronic device, which have good development foreground. It can replace the mechanical potentiometer in many fields. The MCU can program the digitally controlled potentiometer through interface circuit to compose programmable analogy device. The paper provides the principle of the test circuit of the digitally controlled potentiometer, and expatiates the test methods and test data and note items of the test technology. The test parameters include integral nonlinearity error, differential nonlinearity error, the wiper resistance and wiper capacitance. When using the key stroking digitally controlled potentiometer, the debouncing circuit has to be used to avoid the misoperation caused by the bounce. The misoperation will cause that the setup value of the potentiometer is not accordant with the times of key pressing. Analyzing the waveform of the bounce, we find out that the character of the waveform is a kind of high frequency noise. They are sharp pulse or wider pulse, and have some randomness. In the close process, the amplitude of the voltage of the pulses lower and lower, in the end the amplitude reached low level. In the open process the amplitude of the voltage of the pulses higher and higher, in the end the amplitude reached high level. The paper expatiates the debouncing circuit design of the key press digitally controlled potentiometer. The first project is using filter and time delay to avoid the bouncing time. The second project is using software and bouncing judge methods the two projects can be selected in need. The theory and the test methods are all verified and of practical value.

The structure and basic theory of automatic inclinometer system was presented, which take advanced quartz servo-accelerometer as sense organ. Quartz inclinometer can be used to measure the vertical vector of gravitation g in axes using probe sensor in order to confirm the incline angle of probe axes relatively horizontal. Therefore uprightness displacement of probe axes relatively horizontal can be calculated based on this measure principle .The paper presents the real-time measuring curve of quartz inclinometer. The result indicates that the system has many merits, such as high measure precision, better anti-jamming character, light mass, low power cost and it fits fieldwork for power supply by battery.