51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

Monday, January 5th, 2009 at 15:14 | No comments

Categories: Power Supply

Tags: Power source

Short Content: Author Email: alecyan@sh163.net   Portable product electrical power system design requirements The portable product power source design needs the system-level thought that when development by battery power supply equipment, such as handset, MP3, PDA, PMP, DSC and so on low power loss product, if the electrical power system designs unreasonable, will then affect overall system's construction, the product characteristic combination, part's choice, software's design and the power distribution construction and so on. Similarly, in system design, must from save the ...

Tuesday, December 30th, 2008 at 01:45 | No comments

Categories: Power Supply

Tags: Power source

Short Content:     Abstract: Si9731 is one kind may carries on the pulse charge to 1 lithium ion battery or 1~3 nickel cadmium/nickel hydrogen battery battery charger IC. Its battery charge may complete under the system processor's positive governing. In the article introduced the Si9731 main feature, the internal structure, the pin function and the principle of work, and give Si9731 the design main point.     Key word: Integrated circuit; μP control; Battery charger 1 Si9731 main feature The Si9731 battery charger ...

Sunday, December 7th, 2008 at 14:09 | No comments

Categories: Power Supply

Tags: Power source

Short Content: Along with the mobile equipment application's popularization, increases gradually to the negative polarity voltage source's demand. Has a negative voltage power source this procedure with a positive voltage input source, the cost both are high, and is quite complex, when specially designs needs the positive voltage and the negative voltage two kind of outputs is so. Figure 1 showed an economical simple solution, it combined a voltage invertor and a doubler an electric charge pump electric circuit. This electric circuit ...

Saturday, November 29th, 2008 at 01:05 | No comments

Categories: SCM

Tags: ARM, PID, Power source, temperature control

Short Content: Abstract: This article has designed one kind of temperature control system, it ARM7 essence S3C44B0 which produces based on Tristar Corporation, by the Pt100 thermal resistance gathering temperature signal, obtains the actual temperature value through the RWB temperature transmitting instrument and a/D transformation, simultaneously through the LCD real time display; Through the adjustment pulse-duration modulation's dutyfactor, the controlled heating electric circuit relay's make-and-break time, realizes the temperature closed-loop control. The article introduced this system's constitution principle, realizes the flow, and ...

Wednesday, November 26th, 2008 at 01:55 | No comments

Categories: EDA/PLD

Tags: FPGA, PLD, Power source

Short Content: As a result of the semiconductor fabrication technology's reason, the low voltage component's cost is lower than the traditional 5V component, the performance is more superior, in addition the most component's I/O feet may compatible 5v/3.3v the TTL level, be possible to use directly in the original system, therefore each big semiconductor company low voltage integrated circuits and so on 3.3v,2.5v takes the promotion key, if the high-end DSP, PLD/FPGA product has widely used 3.3v,2.5v even the 1.8v,1.5v power supply. Facing ...

Tuesday, November 25th, 2008 at 12:42 | No comments

Categories: SCM

Tags: antijamming, PCB, Power source

Short Content: Abstract: The monolithic integrated circuit system is often undertaking the very vital task in the space instrument, because the monolithic integrated circuit belongs to the sensitive component to the disturbance, easy to come under the disturbing effect, causes the overall system paralysis, therefore should consider the antijamming question fully in the system design, enhances system's reliability. Reason which produces according to the disturbance, union practice, introduced in the space instrument from the hardware and the software two aspects the monolithic ...

Tuesday, November 18th, 2008 at 14:12 | No comments

Categories: EDA/PLD

Tags: FPGA, Power source

Short Content:     Introduction 　　When designs the programmable gate array (FPGA) the electric circuit, must the extreme take the power source question, thus enables the final product the non-flaw work to punish at the same time under all possible conditions in the most superior condition. The FPGA electric circuit power source has the question which two items must consider: On FPGA electric circuit electricity request and electric circuit power loss analysis. This article in view of these two aspect's request, discusses the ...

Thursday, October 16th, 2008 at 08:27 | No comments

Categories: Communication Networks

Tags: LVDS, Power source

Short Content: Author Email: whm@whm-assoc.com When has the massive independent suppliers, the project work good monostable multi-frequency oscillator is quite easy, even if is the design also only calculates a medium difficulty by the 5V single power source power supply stable state multi-frequency oscillator the challenge. But the project work in 3.3V, the performance good monostable multi-frequency oscillator wants difficult somewhat. The CMOS threshold value's change causes them to be unable precisely fixed time; Moreover, the limited voltage "the clearance" causes in ...

Monday, September 8th, 2008 at 04:22 | No comments

Categories: DSP

Tags: 56F803, DSP, Power source, ultrasonic wave

Short Content: Abstract: In view of high-power ultrasonies power source high accuracy, high power output characteristic. Has made the improvement to the ultrasonic wave power source control policy. Proposed that one kind the cyclical partition phase shifting control policy which unifies based on the 56F803 DSP frequency track and the power regulation. Has studied based on this control method ultrasonic wave power source.Key word: Ultrasonic wave power source; Frequency track and power coordination control; Ultrasonic generator; Digital signal processor; 56F803 1 introduction    ...

Saturday, August 16th, 2008 at 17:05 | No comments

Categories: SCM

Tags: Power source

Short Content: Except the micro controller, the micro controller application includes the low level sensor signal and the suitable power source driving circuit frequently, needs to design the power source and the earth carefully. This article will discuss the noise source and the noise path of propagation. We will involve behind the good layout custom the theory and to the noise the influence. We will also discuss isolate and limit the noise part's suitable choice and the layout method.The system block diagram ...