| 微波信号调制电路设计与实现 |
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| 引用本文： | 李周利,赵学敏,黄天录.微波信号调制电路设计与实现[J].电子测试,2012(5):89-92. |
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| 作者姓名： | 李周利 赵学敏 黄天录 |
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| 作者单位： | 1. 西安石油大学电子工程学院,陕西西安,710065
2. 西安通信学院基础部,陕西西安,710106 |
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| 摘 要： | 在智能微波开关的发射电路中,对高频微波信号采用了低频和中频两级调制的方法。为避免现场多对智能微波开关之间的相互干扰,首先用37～51 Hz分8级可调的低频高占空比方波信号调制21 kHz固定频率的中频信号,再用该信号调制10 GHz的高频微波信号。在信号调制的同时,用低频信号控制MOS管对高频微波模块的DC-DC供电电源反馈回路进行干预,使DC-DC电路工作于最佳状态,输出电压峰值平稳,避免了高频发射模块间歇式工作对电源电路输出的影响,提高了智能微波开关的测量精度和工作的可靠性。设计结果与理论分析结果比较接近,达到了设计要求。
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| 关 键 词： | 调制电路 555振荡器 微波开关 微波信号 |
Design and implementation of modulation circuit for microwave signal |
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| Li Zhouli,Zhao Xuemin,Huang Tianlu.Design and implementation of modulation circuit for microwave signal[J].Electronic Test,2012(5):89-92. |
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| Authors: | Li Zhouli Zhao Xuemin Huang Tianlu |
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| Institution: | 1 Xi’an Shi You University,School Of Electronic Engineering,Xi’an 710065; 2 Xi’an Communications Institute,Xi’an 710106) |
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| Abstract: | In transmission circuit of a smart microwave switch,both the low-frequency and the mid-frequency signals are transformed into microwave frequency.To avoid several couple smart microwave switches interfere with each other,first,the 21 kHz fixed-frequency signal is modulated by a high-duty-cycle square wave signal which frequencies are adjustable from 37 Hz to 51 Hz as 8-levels.secondly,the modulated signal modulates microwave.At the same time,the low-frequency signal controls a MOSFET to regulate the feedback signal of the DC-DC circuit of the microwave module.The regulating operation makes the DC-DC circuit to work in best state,prevent effects from intermittent work of the high-frequency module.The output voltage of the DC-DC circuit is very smooth.The measuring precision and reliability are improved.Design results are close the theoretical results and meet the design requirements. |
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| Keywords: | modulation circuit 555 oscillator microwave switch microwave signal |
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