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---恢复内容开始--- OBDII Interface Project When I can ever find enough time away from schoolwork, I try to work on an OBDII compliant portable ScanTool. However, with my current course load and lab projects progress on this project has been very slow. I fi…

The most common switching-power topology is a buck converter, which efficiently transforms high voltages to low voltages. Figure 1 shows a typical buck converter in which the N-channel MOSFET, Q1, needs a floating-gate drive signal. The floating-gate…

Many electronic devices require user input for setting the application properties. Typical input devices include pushbuttons, potentiometers, and touchscreens. To minimize overall project cost, you may have to select low-range microcontrollers, FPGAs…

http://e2e.ti.com/blogs_/b/analogwire/archive/tags/DAC%2bEssentials DAC Essentials: A new blog series A digital-to-analog converter, or DAC, performs the opposite function of an analog-to-digital converter, or ADC. Duh, right? But, have you ever wond…

RFID读写器的工作原理 RFID的数据采集以读写器为主导,RFID读写器是一种通过无线通信,实现对标签识别和内存数据的读出和写入操作的装置. 读写器又称为阅读器或读头(Reader).查询器(Interrogator).读出装置(Reading Device). 扫描器(Scanner).通信器(Communicator).编程/编码器(Programmer)等等. 读写器工作原理 RFID读写器的基本原理是利用射频信号与空间耦合传输特性,使电子标签与阅读器的耦合元件在射频耦合通道内进行能量传…

Transistor Tutorial Summary Transistor Tutorial Summary Bipolar Junction Transistor Tutorial We can summarise this transistors tutorial section as follows: The Bipolar Junction Transistor (BJT) is a three layer device constructed form two semiconduct…

This 125 kHz RFID reader http://www.serasidis.gr/circuits/RFID_reader/125kHz_RFID_reader.htm http://www.serasidis.gr/circuits/RFID_reader/images/125kHz_RFID_reader_schem.GIF I will try to explain with simple words how the RFID works. The ATtiny13 use…

Figure 3-7 shows a block diagram of a DSP system, as the sampling theorem dictates it should be. Before encountering the analog-to-digital converter, the input signal is processed with an electronic low-pass filter to remove all frequencies above the…

DC-DC Controllers Use Average-Current-Mode Control for Infotainment Applications Abstract: Auto infotainment products (multimedia and telematics) are demanding more power and challenging a vehicle's power-management systems. This application note exp…

LDO Regulator High accuracy voltage regulator Vout = 2.5V * (1 + ( 5.6 / 6.8 ) ) = 4.55V Recently the author had to adapt  a standard circuit configuration  (which often uses an npn bipolar) so as to operate as a low-dropout (LDO) regulator. The circ…

Voltage Translation for Analog to Digital Interface ADC http://openschemes.com/2010/03/23/zeroplus-logic-cube-review-and-teardown/ LAP 16032 has 4.5MBIT SRAM and can aquire up to 128k per chn, now my LAP 16032 has 18MBIT SRAM It’s a good product, and…

http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1824&appnote=en011794 In many applications, a DC/DC Converter is used to produce a regulated voltage or current, derived from an unregulated power supply, or from a battery. Ex…

http://www.design-reuse.com/articles/14886/fully-digital-implemented-delta-sigma-analog-to-digital-converter.html by Dr. Michael  Gude & Gerriet MuellerCologne Chip AG, Koeln (Cologne), Germany Abstract One of the most challenging tasks in Analog to…

Universally Compatible Wireless Power Using the Qi Protocol Wireless charging of portable electronic devices is here now. It will become ubiquitous when all such devices adhere to the same standard. By Upal Sengupta and Bill Johns, Texas Instruments…

[博客大赛]使用LM2677制作的3V至24V数控可调恒压源   http://bbs.ednchina.com/BLOG_ARTICLE_3013105.HTM LM2677,是TI公司生产的高效率5A开关buck稳压器,由于它内部具备的low ON-register DMOS功率开关,使得它能够驱动大电流负载.LM2677有+3.3V.+5V.+12V和AJUSTABLE四个版本,其中AJUSTABLE的输出范围是1.2V~37V,使用它可以做一个可调的恒压源. 官方手册中给出的AJUSTA…

ADC分类 直接转换模拟数字转换器(Direct-conversion ADC),或称Flash模拟数字转换器(Flash ADC) 循续渐近式模拟数字转换器(Successive approximation ADC) 跃升-比较模拟数字转换器(Ramp-compare ADC) 威尔金森模拟数字转换器(Wilkinson ADC 集成模拟数字转换器(Integrating ADC) Delta编码模拟数字转换器(Delta-encoded ADC) 管道模拟数字转换器(Pipeline ADC…

http://sourceforge.net/projects/openprogrammer/?source=navbar Open Programmer http://openprog.altervista.org/OP_eng.html#Quick Open Programmer v0.8.x Quick facts Completely free and Open Source (including firmware) Programs PIC10-12-16-18-24, dsPIC30…

http://www.planetanalog.com/author.asp?section_id=3041&doc_id=563055 Jonathan Harris, Product Applications Engineer, Analog Devices, 6/2/2014 As I thought about where to go with the next blog, I looked over the comments and questions from my previous…

It's a Buck; It's a Boost, No! It's a Switcher! Sanjaya Maniktala, National Semiconductor Corp., Santa Clara, CA We like to give everything a name or label very quickly. We probably feel we can then easily identify the object in the future, and also…

In certain dc/dc-converter applications, on-chip, cycle-by-cycle current limit may be insufficient protection to prevent a failure during a short circuit. A nonsynchronous boost converter provides a direct path from the input to the short circuit thr…

Dual-polarity supply provides ±12V from one IC VC (Pin 1): Error Amplifier Output Pin. Tie external compensation network to this pin or use the internal compensation network by shorting the VC pin to the COMP pin.External compensation consists of pla…

Targeting use in portable-system applications that require raising a battery's voltage to a higher level, IC boost regulators often include output transistors that can drive storage inductors. However, most boost regulators' absolute-maximum input-vo…

Buck regulators find wide application as step-down regulators for converting large positive input voltages into a smaller positive output voltages. Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that is, the in…

http://www.ti.com/lit/an/slva299a/slva299a.pdf Many boost converters have an external rectifier diode. The input voltage of the TPS61170 main boost converter is connected to the output voltage when the device is disabled. Due to the direct pass from…

Single Inductor Buck-Boost Converter in Tiny WCSP The TPS63036 is a non inverting buck-boost converter able to provide a regulated output voltage from an input supply that can be higher or lower than the output voltage. The buck-boost converter is ba…

As shown in figure 3.4, PWM controller contains two main parts; voltage error-amplifier and voltage comparator. The error-amplifier compares the feedback voltage VF (applied to inverting input) to reference voltage VREF (applied to non-inverting inpu…

BACKGROUND INFORMATION In a typical data processing environment, data may be transmitted in multiple packets, e.g., words, from one element, e.g., cache, to another element, e.g., processor, over a bus, e.g., parallel bus. A hamming distance may refe…

Google : Op-Amp Level Shifter Level shifting a +/- 2.5V signal to 0 - 5V I have a front end module that generates an (ECG) signal that varies from +/-2.5 V. I want to shift this signal to 0 - 5V. What is the best way to do this? First thing to try is…

Building a Differential Amplifier An op-amp with no feedback is already a differential amplifier, amplifying the voltage difference between the two inputs. However, its gain cannot be controlled, and it is generally too high to be of any practical us…