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单片机编程 基于DAC7512的数控直流恒流源设计

为了解决磁放大器性能测试过程中,需要对其供给不同数值恒定电流的问题,设计了一种基于DAC7512和单片机的数控恒流源系统。该系统采用AT89C51作为主控器件,将计算机发送的电流控制字命令转换为D/A转换器控制字,通过模拟SPI通信接口,写D/A控制字到DAC7512,从而控制其输出相应数字电压值,经差动缩放电路、电压/电路变换 ...
https://www.eeworm.com/dl/502/29315.html
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通信网络 ISM射频接收器的基带计算

Abstract: Many industrial/scientific/medical (ISM) band radio frequency (RF) receivers use an external Sallen-Key datafilter and a data slicer to generate the baseband digital output. This tutorial describes the ISM-RF Baseband Calculator,which can be used to calculate the filter capacitor values ...
https://www.eeworm.com/dl/564/33532.html
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通信网络 EDGE信道分配原则

  Contents   1 Introduction 1   2 Glosary 1   2.1 Concepts 1   2.2 Abbreviations and acronyms 4   3 Capabilities 6   4 Technical Description 6   4.1 General 6   4.2 Service oriented Allocation of Resources on the Abis   interface (SARA) 8   4.3 Configuration of dedicated PDCHs ...
https://www.eeworm.com/dl/564/33849.html
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教程资料 Cadence_16.6_OrCAD_Capture_CIS_新功能 连载(二)

今天我要和大家说的是capture 在查找和替换上做出的一些更新。在以前的版本中,我们只能查找一些和property values 相对应的内容。16.6 版本可以允许通过标准语法的表达式来查找更多的内容。同时也在查找窗口下加了2 个菜单。 ...
https://www.eeworm.com/dl/cadence/doc/36689.html
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可编程逻辑 Cadence_16.6_OrCAD_Capture_CIS_新功能 连载(二)

今天我要和大家说的是capture 在查找和替换上做出的一些更新。在以前的版本中,我们只能查找一些和property values 相对应的内容。16.6 版本可以允许通过标准语法的表达式来查找更多的内容。同时也在查找窗口下加了2 个菜单。 ...
https://www.eeworm.com/dl/kbcluoji/38912.html
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可编程逻辑 计算FR4上的差分阻抗(PDF)

Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to ...
https://www.eeworm.com/dl/kbcluoji/40417.html
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Java编程 java ejb开发 程序4、语句alter table people add(phone_number varchar2(10)) 的作用是 A 修改表结构 B 为people表添加约束

java ejb开发 程序4、语句alter table people add(phone_number varchar2(10)) 的作用是 A 修改表结构 B 为people表添加约束,约束名称是phone_number C 向people表中添加一列,名称是phone_number,数据类型是varchar2,长度是10 D 上述答案均不正确 5、( )BLOB和CLOB的区别在于 A CLOB只能存放字符类型的数据,而BLOB没 ...
https://www.eeworm.com/dl/633/132904.html
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微处理器开发 机顶盒界面源代码: ## Avoid the so-called SINGAPPL to be initialized at runtime ## Used when the tuner is c

机顶盒界面源代码: ## Avoid the so-called SINGAPPL to be initialized at runtime ## Used when the tuner is controlled externally by I2C and ## the PIDs forced to some specific values.
https://www.eeworm.com/dl/655/146332.html
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Java书籍 A Java virtual machine instruction consists of an opcode specifying the operation to be performed, f

A Java virtual machine instruction consists of an opcode specifying the operation to be performed, followed by zero or more operands embodying values to be operated upon. This chapter gives details about the format of each Java virtual machine instruction and the operation it performs.
https://www.eeworm.com/dl/656/147597.html
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Java书籍 A Java virtual machine instruction consists of an opcode specifying the operation to be performed, f

A Java virtual machine instruction consists of an opcode specifying the operation to be performed, followed by zero or more operands embodying values to be operated upon. This chapter gives details about the format of each Java virtual machine instruction and the operation it performs.
https://www.eeworm.com/dl/656/147598.html
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