·详细说明:双音多频的DTMF信号编码程序,产生DTMF信号进行编码。- The double sound multi- frequencies DTMF signal coded program, produces the DTMF signal to carry on the code.
上传时间: 2013-04-24
上传用户:yangzhiwei
摘要:本文主要介绍以CPLD 芯片进行十字路口的交通灯的设计,用CPLD 作为交通灯控制器的主控芯片,采用VHDL\r\n语言编写控制程序,利用CPLD的可重复编程和在动态系统重构的特性,大大地提高了数字系统设计的灵活性和通用性。\r\n关键词:CPLD;VHDL;交通灯控制器\r\n中图分类号:TP39\r\nAbstract :This paper introduces the electronic-traffic lamp, which is based on the VHDL and is com
上传时间: 2013-08-11
上传用户:aesuser
Abstract: With the large number of analog switches on the market today, there are many performance criteria for a product designer to consider. This application note reviews the basic construction of
上传时间: 2013-11-09
上传用户:xiaohanhaowei
Abstract: It is incredible how many programmable logic controls (PLCs) around us make our modern life possible and pleasant.Machines in our homes heat and cool our air and water, as well as preserve and cook our food. This tutorial explains the importanceof PLCs, and describes how to choose component parts using the parametric tools on the Maxim's website.A similar version of this article was published February 29, 2012 in John Day's Automotive Electronic News.
上传时间: 2013-11-10
上传用户:liaocs77
Who has never experienced oscillations issues when using an operational amplifier? Opampsare often used in a simple voltage follower configuration. However, this is not the bestconfiguration in terms of capacitive loading and potential risk of oscillations.Capacitive loads have a big impact on the stability of operational amplifier-basedapplications. Several compensation methods exist to stabilize a standard op-amp. Thisapplication note describes the most common ones, which can be used in most cases.The general theory of each compensation method is explained, and based on this, specific
上传时间: 2013-10-28
上传用户:chenbhdt
This application note provides a detailed description of themetastable behavior in PLDs from both circuit and statisticalviewpoints. Additionally, the information on the metastablecharacteristics of Cypress PLDs presented here can help youachieve any desired degree of reliability.
上传时间: 2013-10-23
上传用户:gtzj
Designers of signal receiver systems often need to performcascaded chain analysis of system performancefrom the antenna all the way to the ADC. Noise is a criticalparameter in the chain analysis because it limits theoverall sensitivity of the receiver. An application’s noiserequirement has a signifi cant infl uence on the systemtopology, since the choice of topology strives to optimizethe overall signal-to-noise ratio, dynamic range andseveral other parameters. One problem in noise calculationsis translating between the various units used by thecomponents in the chain: namely the RF, IF/baseband,and digital (ADC) sections of the circuit.
上传时间: 2014-12-05
上传用户:cylnpy
The STM32F10xxx microcontroller family embeds up to three advanced 12-bit ADCs (depending on the device) with a conversion time down to 1 μs. A self-calibration feature is provided to enhance ADC accuracy versus environmental condition changes.
上传时间: 2014-12-23
上传用户:eastimage
A complete design for a data acquisition card for the IBM PC is detailed in this application note. Additionally, C language code is provided to allow sampling of data at speed of more than 20kHz. The speed limitation is strictly based on the execution speed of the "C" data acquisition loop. A "Turbo" XT can acquire data at speeds greater than 20kHz. Machines with 80286 and 80386 processors can go faster than 20kHz. The computer that was used as a test bed in this application was an XT running at 4.77MHz and therefore all system timing and acquisition time measurements are based on a 4.77MHz clock speed.
上传时间: 2013-10-29
上传用户:BOBOniu
One of the most critical components in a step-up design like Figure 1 is the transformer. Transformers have parasitic components that can cause them to deviate from their ideal characteristics, and the parasitic capacitance associated with the secondary can cause large resonating current spikes on the leading edge of the switch current waveform.
上传时间: 2013-11-22
上传用户:15070202241