Circuit - 随笔分类(第7页) - IAmAProgrammer

Current limiter allows large USB bypass capacitance

摘要：The USB (Universal Serial Bus) specification requires a connected USB device to present a load to the host or hub of no greater than 10 µF in parallel... 阅读全文

posted @ 2014-11-28 10:05 IAmAProgrammer

Unused port adds a PWM/analog channel to a microcontroller

摘要：Low-cost, 8-bit, single-chip microcontrollers are stingy when it comes to on-chip PWM (pulse-width-modulation) resources. The use of a PWM resource of... 阅读全文

posted @ 2014-11-28 10:04 IAmAProgrammer

ADC for programmable logic uses one capacitor

摘要：Many electronic devices require user input for setting the application properties. Typical input devices include pushbuttons, potentiometers, and touc... 阅读全文

posted @ 2014-11-28 09:46 IAmAProgrammer

Create a DAC from a microcontroller's ADC

摘要：Few microcontrollers include a DAC. Although you can easily find an inexpensive DAC to control from your microcontroller, you can use unused periphera... 阅读全文

posted @ 2014-11-28 09:43 IAmAProgrammer

全驱动编程器引脚驱动图

摘要：驱动 5V CMOS 器件, 内部输出缓冲区配置成开路模式阅读全文

posted @ 2014-11-27 23:19 IAmAProgrammer

Using a Virtex Device to Drive 5V CMOS-Level Signals

摘要：Must tri-state outputs and use an external resistor to pull up to 5VTo drive 5V CMOS-level inputs, a pull-up resistor must be applied to the 5V Virtex... 阅读全文

posted @ 2014-11-27 22:19 IAmAProgrammer

提高开关速度 -- 电容加速电路

摘要：基本的晶体管开关电路饱和开关的问题点：OFF延时时间如图1所示，使场效应晶体管开关动作时，加给晶体管的基极电流IB：IB=IC/hFE，决定的值大的电流。这是由于晶体管的集电极一发射极饱和电压VCE(set)减小，使晶体管的ON时的电力损耗降低的缘故。这样，晶体管饱和动作时，如图2所示，基极电流IB... 阅读全文

posted @ 2014-11-27 17:51 IAmAProgrammer

MC34063组成DC-DC电路

摘要：+VO的输出电压峰值可达2倍V_IN，-VO的输出电压可达-V_IN。需要注意的是，3路的峰值电路不能超过1.5A，同时两路附加电源的输出功率和必须小于V_IN·I·(1-D)，其中I为主输出的电流，D为占空比。在此两路输出电流不大的情况下，此电路可以很好地降低实现升压和负压电源的成本。阅读全文

posted @ 2014-11-22 12:43 IAmAProgrammer

How to implement *All-Digital* analog-to-digital converters in FPGAs and ASICs

摘要：When we engineers look at the complexity of system design these days, we are challenged with cramming more functions into a smaller space, while consu... 阅读全文

posted @ 2014-11-14 13:50 IAmAProgrammer

ADC In An FPGA

摘要：http://davidkessner.wordpress.com/2011/05/01/adc-in-an-fpga/Geek Alert! What follows is very technical. It involves ADC’s, FPGA’s, and sophisticated e... 阅读全文

posted @ 2014-11-14 13:45 IAmAProgrammer

Fully Digital Implemented Delta-Sigma Analog to Digital Converter

摘要：http://www.design-reuse.com/articles/14886/fully-digital-implemented-delta-sigma-analog-to-digital-converter.htmlby Dr. MichaelGude &GerrietMuellerCol... 阅读全文

posted @ 2014-11-14 13:42 IAmAProgrammer

FPGA LVDS I/O as an Analog Programmable Comparator

摘要：http://www.eetimes.com/author.asp?section_id=36&doc_id=1320289Seeing the new ADC IP being bandied about by FPGA vendors got William Murray wondering w... 阅读全文

posted @ 2014-11-14 13:39 IAmAProgrammer

Low-cost ADC using only Digital I/O

摘要：http://letsmakerobots.com/node/13843Reading A Sensor With HigherAccuracy – RC Timing MethodRC Timing Method:Simple RC step responseVc(t) = VDD * (1 - ... 阅读全文

posted @ 2014-11-14 13:02 IAmAProgrammer

采用FPGA实现音频模数转换器

摘要：http://www.21ic.com/app/eda/200905/42832.htmhttp://www.eefocus.com/article/09-10/84673s.html摘要简要分析sigma—deIta(∑一△)架构模数转换器(ADC)原理，提出一种基于FPGA内部LVDS(Lo... 阅读全文

posted @ 2014-11-14 12:53 IAmAProgrammer

serial-input, parallel-output (SIPO) chip : TPIC6595 , 74HC164 , 74HC4094 or 74HC595

摘要：http://electronics.stackexchange.com/questions/6676/which-sipo-chip-is-better-74hc4094-or-74hc595-or-something-elseI want to drive lots of LEDs in a s... 阅读全文

posted @ 2014-11-12 21:10 IAmAProgrammer

Open Source Universal 48 pin programmer design

摘要：http://www.edaboard.com/thread227388.htmlHi, i have designed a 48 pin universal programmer but need help finishing it off, is anyone up for the challa... 阅读全文

posted @ 2014-11-10 20:58 IAmAProgrammer

AC、HC、AHC、ACT、LS的区别

摘要：http://forum.eet-cn.com/thread!printPreview.jspa?threadID=1200029698&start=0以245为例，74AC245、74HC245、74AHC245、74ACT245、74LS245这几个有什么区别，各自的应用领域是什么？这些逻辑电平... 阅读全文

posted @ 2014-06-29 18:53 IAmAProgrammer

Freescale OSBDM JM60仿真器

摘要：OSBDM-JM60 - 9S08JM60 Based OSBDM — It includes interfaces and firmwareapplied to all the targets supported by the previous open source BDMs.It includ... 阅读全文

posted @ 2014-04-29 22:52 IAmAProgrammer

pic/at89c2051 programmer

摘要：http://dangerousprototypes.com/forum/viewtopic.php?t=170It looks like the PICKIT2 uses a small boost converter.http://www.oshonsoft.com/picprogprousb.htmlUSB Pro PIC-PIC18-PIC16-AVR ProgrammerUSB Pro AVR ProgrammerSerial Port Pro PIC-PIC18-PIC16-AVR Programmerhttp://www.oshonsoft.com/picprogproseria 阅读全文

posted @ 2014-04-03 21:46 IAmAProgrammer

IC开短路测试(open_short_test),编程器测试接触不良、开短路

摘要：http://kitebee.meibu.com/forum.php?mod=viewthread&tid=69654&extra=page%3D5IC开短路测试(open_short_test)又叫continuity test 或contact test,它是一种非常快速发现芯片的各个引脚间的是否有短路，及在芯片封装时是否missing bond wires.通常都会被放测试程序的最前面.它还能发现测试时接触是否良好，探针卡或测试座是否有问题.开短路测试的测试原理比较简单，分open_short_to_VDD 测试和open_short_to_VSS测试.一般来说芯片的每个阅读全文

posted @ 2014-04-01 16:50 IAmAProgrammer

随笔分类 - Circuit