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youxi
在单片机开发板上可实现的游戏——俄罗斯方块的C源程序(Microcontroller development board can achieve in a game- Tetris C source)
- 2014-02-24 17:26:55下载
- 积分：1
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LED-S1234
基于STC89C52单片机实现中断LED数码管显示及处理的程序，适合初学值使用(Based STC89C52 MCU interrupt LED digital display and processing procedures, suitable for beginners to use the value)
- 2013-11-19 11:42:46下载
- 积分：1
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ZYCainiao_sch_pcb
自己画的四轴飞行器，原理图，pcb。。。。。。。。。。。。。。。。。。。。。。。为了20个子，我真的不容易(Own painting Four aircraft, schematics, pcb)
- 2013-09-22 16:23:55下载
- 积分：1
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shuanglushuzihecheng
摘要
电能表作为用电量的测量工具广泛的应用于各种场合。在电能表校表系统中,需要的最基本的输入信号源是高精度双路正弦信号源,并要求可对其频率、相位、幅值进行调节,来对电能表进行校准。
基于单片机的程控信号源设计，运用数字调相、数字调幅和数字调频等技术，要求实现相位、幅度、频率的高精度程控调节。本文设计了一种利用锁相环频率合成技术和数字波形合成技术组成的程控低频正弦波信号发生器，并给出了调幅、调频、调相的实用电路，频率调节通过改变8253计数器的分频系数来实现；相位调节由51单片机预置计数器的计数初值来完成，幅度的调整通过改变DAC1210II的参考电压来实现，使频率分辨率达0.01Hz,相位调节精度达0.1°，并介绍电路中的主要芯的功能及使用。输出正弦波频率和幅值的精度高，稳定性好，失真度低，电路简单、可靠、便于程控。
关键词：数字合成信号源；程控；调幅；调频；移相；
(Abstract
Meter consumption as the size of the measurement tool is widely used in various occasions. In single-phase power meter verify system, the most basic needs of the input signal is the source of two-way high-precision sine signal source, and may request its frequency, phase, amplitude in a certain step to adjust to the imitate of the actual electricity load with a right meter calibration.
Design of the programmable signal supply controlled source，which based on the MCU，including digital phase adjustment，distal amplitude adjustment，digital frequency adjustment etc．The system should achieve high quality digital adjustment of phase, amplitude and frequency. This paper describes the use of a PLL frequency synthesizer technology, and digital wave form synthesis technology consisting of program-controlled low-frequency sine wave signal issued devices, and applies the amplitude， frequency， phase of practical circuit. Frequency can be adjusted through a change in the 8253 counter-frequ)
- 2021-04-08 20:19:00下载
- 积分：1
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LAPORAN-4
Report about protocol data unit study communiation data
- 2015-01-01 04:19:56下载
- 积分：1
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AD9851-51MCU
基于51单片机的AD9851模块驱动程序(Based on 51 single-chip AD9851 module driver)
- 2012-11-03 01:36:19下载
- 积分：1
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blcdsources
blcd source, it is blcd source can convert from one format to antother
- 2009-07-15 15:11:21下载
- 积分：1
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turtlebot_follower1
ros Ubuntu unix系统条件下，turtle bot二代小车跟随功能包，ros by example书籍中源码(ros follower by hydro unix )
- 2016-08-15 21:15:38下载
- 积分：1
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Smart_Home-master
说明： 一个智能家居控制程序，zigbee CC2530 程序源码(A smart home control program, ZigBee CC2530 source code)
- 2020-06-19 05:00:02下载
- 积分：1
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ABAQUS-UMAT
ABAQUS中UMAT子程序的实例详细解释(Detailed examples in ABAQUS UMAT subroutine)
- 2014-05-12 16:04:07下载
- 积分：1
