| 基于VCA822的正弦信号发生器程控放大器 |
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| 引用本文： | 张霆.基于VCA822的正弦信号发生器程控放大器[J].成都电子机械高等专科学校学报,2009,12(3):34-37. |
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| 作者姓名： | 张霆 |
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| 作者单位： | 成都电子机械高等专科学校; |
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| 摘 要： | DDS芯片产生的信号幅值不可控制,且随着频率改变,输出信号幅值在一定范围内改变,然而作为信号源常常需要信号幅值的精确控制。本文利用TI公司的可控增益放大器VCA822设计了增益自动调整电路和程控放大电路。实现将DDS芯片产生的不确定幅值的正弦波通过增益自动调整电路后,变化为固定幅值的正弦信号,再通过程控放大器完成输出正弦信号幅值0.5V～5V程控可调。
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| 关 键 词： | DDS 可控增益放大器 峰值检波 程控放大器 |
Digital Programmable Amplifier of the Sine Signal Generator Based on VCA822 |
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| Zhang Ting.Digital Programmable Amplifier of the Sine Signal Generator Based on VCA822[J].Journal of Chengdu Electromechanical College,2009,12(3):34-37. |
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| Authors: | Zhang Ting |
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| Affiliation: | Chengdu Electromechanical College;Chengdu 610031;China |
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| Abstract: | The signal amplitude produced by DDS chip is generally uncontrollable,and the output signal amplitude changes within a certain range with frequency changes.However,precise control of signal amplitude is needed as signal source.Using controllable gain amplifier VCA822 of TI,the author designed an automatic gain adjustment circuit and a programmable amplifier.This makes it possible that the amplitude uncertain sinusoidal wave produced by DDS chip is changed into amplitude fixed sinusoidal signal through the g... |
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| Keywords: | DDS Controllable gain amplifier Peak detector Program-controlled amplifier |
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