Faster, better, and cheaper is the name of the game for machine designers. Demands for higherperformance
and increasingly efficient machines designed in a shorter amount of time with smaller design
teams are challenging machine designers to improve their machine design processes.
In this paper, we discuss efficient coding and design styles using verilog. This can beimmensely helpful for any digital designer initiating designs. Here, we address different problems rangingfrom RTL-Gate Level simulation mismatch to race conditions in writing behavioral models. All theseproblems are accompanied by an example to have a better idea, and these can be taken care off if thesecoding guidelines are followed. Discussion of all the techniques is beyond the scope of this paper, however,here we try to cover a few of them.
The MAX17600–MAX17605 devices are high-speedMOSFET drivers capable of sinking /sourcing 4A peakcurrents. The devices have various inverting and noninvertingpart options that provide greater flexibility incontrolling the MOSFET. The devices have internal logiccircuitry that prevents shoot-through during output-statchanges. The logic inputs are protected against voltagespikes up to +14V, regardless of VDD voltage. Propagationdelay time is minimized and matched between the dualchannels. The devices have very fast switching time,combined with short propagation delays (12ns typ),making them ideal for high-frequency circuits. Thedevices operate from a +4V to +14V single powersupply and typically consume 1mA of supply current.The MAX17600/MAX17601 have standard TTLinput logic levels, while the MAX17603 /MAX17604/MAX17605 have CMOS-like high-noise margin (HNM)input logic levels. The MAX17600/MAX17603 are dualinverting input drivers, the MAX17601/MAX17604 aredual noninverting input drivers, and the MAX17602 /MAX17605 devices have one noninverting and oneinverting input. These devices are provided with enablepins (ENA, ENB) for better control of driver operation.
Abstract: Specifications such as noise, effective number of bits (ENOB), effective resolution, and noise-free resolution inlarge part define how accurate an ADC really is. Consequently, understanding the performance metrics related to noise isone of the most difficult aspects of transitioning from a SAR to a delta-sigma ADC. With the current demand for higherresolution, designers must develop a better understanding of ADC noise, ENOB, effective resolution, and signal-to-noiseratio (SNR). This application note helps that understanding.
The LM20, LM45, LM50, LM60, LM61, and LM62 are analog output temperature sensors. They have various output voltage slopes (6.25mV/°C to 17mV/°C) and power supply voltage ranges (2.4V to 10V).The LM20 is the smallest, lowest power consumption analog output temperature sensor National Semiconductor has released. The LM70 and LM74 are MICROWIRE/SPI compatible digital temperature sensors. The LM70 has a resolution of 0.125°C while the LM74 has a resolution of 0.625°C. The LM74 is the most accurate of the two with an accuracy better than ±1.25°C. The LM75 is National’s first digital output temperature sensor, released several years ago.
Avalanche photo diode (APD) receiver modules arewidely used in fi ber optic communication systems. AnAPD module contains the APD and a signal conditioningamplifi er, but is not completely self contained. It stillrequires signifi cant support circuitry including a highvoltage, low noise power supply and a precision currentmonitor to indicate the signal strength. The challenge issqueezing this support circuitry into applications withlimited board space. The LT®3482 addresses this challengeby integrating a monolithic DC/DC step-up converter andan accurate current monitor. The LT3482 can supportup to a 90V APD bias voltage, and the current monitorprovides better than 10% accuracy over four decades ofdynamic range (250nA to 2.5mA).
實(shí)時(shí)時(shí)鐘是微機(jī)保護(hù)裝置的重要部件，在討論P(yáng)CF8583結(jié)構(gòu)與功能的基礎(chǔ)上，提出采用dsPIC33F系列微處理器與串行I2C時(shí)鐘PCF8583的接口設(shè)計(jì)方案，給出了相應(yīng)的接口電路與軟件流程。該設(shè)計(jì)方案結(jié)構(gòu)簡(jiǎn)單，可靠性高，開(kāi)發(fā)周期短，具有一定的實(shí)用與參考價(jià)值。所設(shè)計(jì)的微機(jī)保護(hù)裝置已投入現(xiàn)場(chǎng)運(yùn)行，效果良好。
Abstract:
Real-time clock chip is an important part in microcomputer protection device.Based on discussing the structure and function of PCF8583，a new interface scheme which uses dsPIC33F microprocessor and serial clock chip（I2C）PCF8583is proposed.The method of the circuit design and the main software flow are introduced in this paper.The scheme has simple structure，higher reliability and shorter exploitation cycle，so has definite practicality or reference value.The microcomputer protection device has been put into operation with better effects.
設(shè)計(jì)一種基于AT89C52的語(yǔ)音錄放系統(tǒng)，利用單片機(jī)、ISD2560語(yǔ)音錄放器件、麥克風(fēng)、揚(yáng)聲器等元器件實(shí)現(xiàn)硬件電路的設(shè)計(jì)，并利用C51高級(jí)語(yǔ)言設(shè)計(jì)ISD2560器件控制字的寫(xiě)入和定時(shí)中斷程序。經(jīng)軟硬件調(diào)試，結(jié)果表明該系統(tǒng)錄放效果良好，具有一定的工程實(shí)用價(jià)值。
Abstract:
Voice recording and playback system based on AT89C52is designed in this paper.Using the single-chip microcomputer，voice recording and playback chip ISD2560，microphone and speaker to realize the hardware circuit design.Writing ISD2560control words and timing interrupt procedures are designed by C51advanced language.Through the hardware and software test,voice recording and playback system play better voice,and this system has some engineering practical values.
為深入了解基于UC3854A控制的PFC變換器中的動(dòng)力學(xué)特性，研究系統(tǒng)參數(shù)變化對(duì)變換器中分岔現(xiàn)象的影響，在建立Boost PFC變換器雙閉環(huán)數(shù)學(xué)模型的基礎(chǔ)上，用Matlab軟件對(duì)變換器中慢時(shí)標(biāo)分岔及混沌等不穩(wěn)定現(xiàn)象進(jìn)行了仿真。在對(duì)PFC變換器中慢時(shí)標(biāo)分岔現(xiàn)象仿真的基礎(chǔ)上，分析了系統(tǒng)參數(shù)變化對(duì)分岔點(diǎn)的影響，并進(jìn)行了仿真驗(yàn)證。仿真結(jié)果清晰地顯示了輸入整流電壓的幅值變化對(duì)系統(tǒng)分岔點(diǎn)的影響。
Abstract:
In order to better understand the dynamics characteristic of power factor correction converter based on UC3854A， and make the way that parameters change influences the bifurcation phenomena of the system clearly. The math model of the two closed loop circuits to the Boost PFC （Power Factor Correction） converter controller was built. Then， with the help of Matlab， the simulation for nonlinear phenomena such as chaos and slow-scale bifurcation in the PFC converter was made. Finally the factors that have influence to the phenomenon of bifurcation under slow-scale in PFC converter were analyzed. The simulation results clearly show the parameters change influences the bifurcation point of the system.
