Description: 本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。-the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D / A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current / voltage changes, the A / D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the Platform: |
Size: 197253 |
Author:DAI |
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Description: 实现智能大厦自动报警系统主要是通过串口通信来实现的。计算机对数模转换设备发送到端口的数据进行处理，并根据用户摄设置信息作出相应动作，同时通知大厦管理人员，确保万无一失。-Intelligent Building automatic alarm system is mainly through serial communications to achieve. Computer digital-to-analog converter equipment sent to the port handling the data, and setting up user information taken action accordingly, notify the building management staff, to ensure that everything goes well. Platform: |
Size: 4270638 |
Author:不是神 |
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Description: The DAC7512 is a low-power, single, 12-bit buffered voltage output Digital-to-Analog Converter (DAC). Its on-chip precision output amplifier allows rail-to-rail output swing to be achieved. The DAC7512 uses a versatile three-wire serial interface that operates at clock rates up to 30MHz and is compatible with standard SPI™, QSPI™, Microwire™, and DSP interfaces. Platform: |
Size: 693857 |
Author:ichn0576@qq.com |
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Description: 本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。-the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the Platform: |
Size: 196608 |
Author: |
Hits:
Description: 实现智能大厦自动报警系统主要是通过串口通信来实现的。计算机对数模转换设备发送到端口的数据进行处理，并根据用户摄设置信息作出相应动作，同时通知大厦管理人员，确保万无一失。-Intelligent Building automatic alarm system is mainly through serial communications to achieve. Computer digital-to-analog converter equipment sent to the port handling the data, and setting up user information taken action accordingly, notify the building management staff, to ensure that everything goes well. Platform: |
Size: 4270080 |
Author:不是神 |
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Description: 计算电压基准的温度系数(tempco)和初始精度:摘要：电压基准(VREF)的主要目标是设立系统精度。例如，模/数转换器(ADC)根据基准电压设置其满量程输入电平。下文讨论了如何在初始精度和温度系数(tempco)之间进行折中，在保证满足系统精度的前提下拓宽电压基准的选择范围。下面介绍的计算方法可根据给定的初始精度确定温度系数，反之亦然。
-Calculation of the temperature coefficient voltage reference (tempco) and initial accuracy: Abstract: The voltage reference (VREF) of the main objectives is the establishment of system accuracy. For example, the analog/digital converter (ADC) according to the reference voltage set up its full-scale input level. Below discusses how the initial accuracy and temperature coefficient (tempco) compromise between, in ensuring the system under the premise of accuracy voltage reference to broaden the range of options. Introduce the following method of calculation can be given to determine the initial accuracy of temperature coefficient, and vice versa. Platform: |
Size: 137216 |
Author:ccc |
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Description: 数字直流稳压器：
用单片机来设置输出电压，把单片机设置的数值通过D\A数模转换变换为模拟电压，然后通过输出的模拟电压，控制稳压模块的输出，稳压模块由可调稳压块LM317和双运算放大器LM358构成，通过LM358比较输出和设置电压并控制LM317的输出，以达到比较精确的输出，用三位数码管动态显示输出电压值，精确到0.1V。-Digital DC Regulators: MCU to set the output voltage, the single-chip set of values through the digital-analog converter DA transform analog voltage, and then through the analog output voltage, the control module s output voltage regulator, voltage regulator modules from LM317 adjustable regulator block and dual op-amp LM358 constitute, by comparison LM358 voltage output and set up and control the output of LM317, so as to achieve more precise output, with the three digital tube dynamic display the output voltage value, accurate to 0.1V. Platform: |
Size: 5120 |
Author:陈巍巍 |
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Description: 数字上变频DUC是与数字下变频ddc相对应的工作.目前实现方式主要有:专用芯片,通用DSP和FPGA实现三种.本程序即给出了XILINX公司的Digital Up Converter核心程序(IP CORE)以及响应的使用说明,对于从事雷达,无线通信的工程人员和研究者有很大用处.-DUC is a digital up-conversion and digital down conversion that corresponds to the work of ddc. Realize the current approach are: ASIC, DSP and FPGA generic realize three. This procedure is given that the company XILINX core Digital Up Converter program (IP CORE) and to respond to instructions, for radar, wireless communications, engineers and researchers have great usefulness. Platform: |
Size: 305152 |
Author:周严 |
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Description: CS4341音频DA转换器的Linux的驱动程序，CS4341将I2S数字音频信号转换为模拟音频，可外接功放或有源音响。最多支持2个声道。-CS4341 audio DA converter Linux driver, CS4341 will I2S digital audio signal is converted to analog audio to an external amplifier or active stereo. Supports up to two channels. Platform: |
Size: 7168 |
Author:wenbinwu |
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Description: 软件无线电中数字上下变频器研究与实现，适合通信专业人员参考-Digital Software Radio Research and Implementation of up and down converter for communication professionals reference Platform: |
Size: 3354624 |
Author: |
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Description: vhdl硬件设计实现一个数字上变频器，实现数字上变频-vhdl hardware design on the realization of a digital converter, digital up-conversion Platform: |
Size: 21504 |
Author:张顺 |
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Description: 自己总结整理的12位ADC数模转换芯片资料，含应用方法
-Finishing their own summing up the number of 12-to-analog converter chip ADC information, including application Platform: |
Size: 364544 |
Author:李与 |
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Description: 采用FPGA控制ADS7844进行模数转换。ADS7844 是Burr_Brown公司推出的一种高性能、宽电压、低功耗的12 b串行数模转换器。它有8个模拟输入端，可用软件编程为8通道单端输入A／D转换器或4通道差分输入A／D转换器，其转换率高达200 kHz，而线性误差和差分误差最大仅为±1 LSB。-Using FPGA control ADS7844 analog to digital conversion. ADS7844 is a Burr_Brown the company introduced a high-performance, wide-voltage, low-power 12 b serial DAC. It has 8 analog inputs, available software programming for the 8-channel single-ended input A/D converter or 4-channel differential input A/D converter, the conversion rate of up to 200 kHz, while the maximum linearity error and differential error is only To ± 1 LSB. Platform: |
Size: 160768 |
Author:Liu Bin |
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Description: 该THS5651是一个10位分辨率的数字到模拟转换器（DAC），专为优化数字数据
传输有线和无线通信系统。 10位DAC是一个CommsDAC成员
高速，低功耗CMOS数字系列模拟转换器。该CommsDAC系列由管脚
兼容的14 - ，12 - ，10 - ，和8位DAC。所有设备提供相同的接口选择，小外形封装和
引脚。该THS5651提供优越的AC和DC性能，同时支持更新率高达100 MSPS的。-The THS5651 is a 10-bit resolution digital-to-analog converter (DAC) specifically optimized for digital data
transmission in wired and wireless communication systems. The 10-bit DAC is a member of the CommsDAC
series of high-speed, low-power CMOS digital-to-analog converters. The CommsDAC family consists of pin
compatible 14-, 12-, 10-, and 8-bit DACs. All devices offer identical interface options, small outline package and
pinout. The THS5651 offers superior ac and dc performance while supporting update rates up to 100 MSPS. Platform: |
Size: 580608 |
Author:陈祥 |
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Description: 该器件具有高达15.5V的输出电压，是第一款内置温度传感器、ADC以及查找表(LUT)的高度集成非易失数字电位器系列产品，具有与标准数字电位器相近的成本。
DS3501提供了一个ADC可寻址的36字节LUT，查找的温度跨度范围为-40℃至+100℃。可以使用LUT输出加上非易失初值寄存器(IVR)的值或LUT输出直接替代IVR的值，作为7位线性电位器的输入。该架构可支持许多应用，例如LCD背板、光接收器以及工业控制这类理想控制电压随温度变化而变的应用。DS3501专门设计可适合于电压随温度变化线性改变或非线性改变两种不同的应用
-The DS3501 is a 7-bit, nonvolatile (NV) digital potentiometer
featuring an output voltage range of up to 15.5V.
Programming is accomplished by an I2C-compatible
interface, which can operate at speeds of up to 400kHz.
External voltages are applied at the RL and RH inputs to
define the lowest and highest potentiometer outputs.
The DS3501 contains an on-chip temperature sensor
and associated analog-to-digital converter (ADC). The
ADC output addresses a 36-byte NV lookup table
(LUT). The LUT output can drive the pot directly or be
added to an NV initial-value register (IVR) to drive the
pot. This flexible LUT-based architecture allows the
DS3501 to provide a temperature-compensated potentiometer
output with arbitrary slope. Platform: |
Size: 4096 |
Author:Mengliang Yi |
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Description: 数字录音机的微机实验，8086汇编语言编写
设计内容及连接电路：
1、将声传感器接J2，把代表语音的电信号送给ADC0809通道2(IN2)；D/A转换器的输出端J1接喇叭。电路如下
2、编程以每秒钟5000次的速率采集IN2输入的语音数据并存入内存，共采集60000个数据（录12秒），然后再以同样的速率将数据送DAC0832使喇叭发声（放音） -Computer simulation, digital recorder, 8086 assembly language content and connect the circuit design: 1, the acoustic sensor then J2, to represent the voice of the electrical signals sent to ADC0809 Channel 2 (IN2) D/A converter output connected speakers J1 . Circuit as follows 2, programmed to a rate of 5,000 per second IN2 input voice data collected and stored memory, the data were collected from 60 000 (recorded in 12 seconds) and then to send the same data rate so that the speaker sound DAC0832 (up tone) ... ... Platform: |
Size: 2048 |
Author:hauos |
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Description: 公司最近做的一个项目数字上变频DUC simulink建模 花了我两个礼拜心血啊 -this is a project about digital up-converter,it is bulit with Simulink. Platform: |
Size: 140288 |
Author:ganzhhua |
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Description: 针对光伏并网发电系统中关健部件—逆变器的结构设计与控制方法研究进行了详细分析
和阐述。从电网、光伏阵列以及用户对逆变器的要求出发, 分析了各种不同的逆变器拓扑结构与控
制方法, 比较其运行效率和控制效果。对于本文提出了一种基于全桥变换器的正弦波逆变电源的整体设计
方案。文章首先对系统设计中将使用到的DC/DC变换器，DC/AC变
换器以及PWM控制技术在理论上进行了深入的研究。并讨论了数字
式PID控制算法的实现和在系统中的应用，还针对这种基于全桥变换
器的正弦波逆变器提出了一种用一个电压闭环来调节两个控制量的
PID算法。
其次，文章设计了基于全桥变换器、全桥逆变器和以DSP为核
心的逆变电源控制电路，详细介绍了各相关电路模块的原理与结构。
在完成电路参数设计以后，通过使用MATLAB/Simulink软件对整个
系统进行了仿真分析。并对系统软件设计的思路与实现方法以及关键
程序的流程进行了介绍。
最后，通过系统的带载实验对整套系统软硬件设计的合理性进行
了验证。实验结果表明，本文设计的逆变电源硬件电路和软件系统是
成功的。
-The paper comes up with a full-package solution to convert solar power
into AC.This solution is based on the design of the full-bridge converter
and the full-bridge inverter.This paper first gives full analysis on the
theories of power switching technology,inverter technology and PWM
technology.And the theory and fulfillment of PID algorithm are
discussed in this paper.Especially for this solution,this paper comes up
with a PID algorithm in which two variables are being controlled in one
close-loop.
Then,this paper gives the procedure to calculate the main circuit
parameters.The design of digital controlling circuit and assistant circuits,
such as MOSFET driving circuit and voltage protection circuit,are
introduced.Based on the parameters worked out,the paper gives the
simulation of whole system in Matlab/Simulink.This paper also
introduces the firmware design based on the DSP（TMS320F2812）.
The last is the verification of whole system including hardware and
software by t Platform: |
Size: 1939456 |
Author:fmx |
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Description: 1、D/A转换是把数字量转换成模拟量的变换，实验台上D/A电路输出的是模拟电压信号。要实现实验要求，比较简单的方法是产生三个波形的表格，然后通过查表来实现波形显示。
2、产生锯齿波和三角波-1, D/A converter is to convert the digital analog conversion, the experimental stage D/A circuit is an analog voltage output signal. To achieve the requirement of experiment, a relatively simple method is to generate three waveform table, and then look-up table to achieve the waveform display.
2, resulting in sawtooth wave and triangular wave Platform: |
Size: 29696 |
Author:范志豪 |
Hits:
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