摘要
实现了一种用低频率或超低频率的窄脉冲对正弦波高频信号进行调制的方法。该方法在PICC语言平台上设计程序,控制PIC16F877A单片机的PWM功能产生超低频脉冲调制的高频脉冲信号;设计串联谐振电路高频滤波器对高频脉冲进行滤波,把高频脉冲变成纯度较高的高频正弦波;设计衰减器和功率放大器,控制信号幅度。经过测试表明:该方法设计实现的超低频脉冲调制高频信号具有高准确度、高稳定度的优点,满足使用要求。
A kind of low or ultralow frequency narrow pulse modulated high frequency sine wave signal method is realized in this paper. This method programmes on PICC platform, and controls PWM mode of PIC16F877A MCU to produce high frequency signal modulated by ultralow frequency pulse,and designs high frequency filter with series-wound syntonic electrocircuit to filter out impurity from high frequency pulse and change high frequency pulse to pure high frequency sine wave, and designs attenuator and power amplifier to modulate amplitude. Experimental results show that ultralow frequency pulse modulated high frequency signal produced by this method is high-exact and steady-state and satisfies use requirements.
出处
《国外电子测量技术》
2009年第7期33-36,48,共5页
Foreign Electronic Measurement Technology
