CAJ | 학술논문

设计了一款体积小、功耗低、使用灵活、成本低廉的便携式数字扫频仪。系统的硬件设计采用DDS（直接数字式频率合成器）技术产生0~70 MHz的输出频率，电容三点式压控振荡电路及MB1507琐相环电路产生70~500 MHz的输出频率，并用自动电平控制电路，保持输出振幅的稳定，用程控衰减电路实现输出幅度的连续可调。软件设计实现了扫频步进长度的连续可调、及对波形峰值和谷值点的标识。设计创新地使用DDS和PLL技术产生扫频信号，用PTN二极管取代继电器作为波段开关，增加频率的测量范围，提高了系统的响应速度和可靠性。测试结果表明：基于该方案设计的便携式数字扫频仪性能稳定，各项指标优良，频率测量范围为0~500 MHz。
설계료일관체적소、공모저、사용령활、성본저렴적편휴식수자소빈의。계통적경건설계채용DDS（직접수자식빈솔합성기）기술산생0~70 MHz적수출빈솔，전용삼점식압공진탕전로급MB1507쇄상배전로산생70~500 MHz적수출빈솔，병용자동전평공제전로，보지수출진폭적은정，용정공쇠감전로실현수출폭도적련속가조。연건설계실현료소빈보진장도적련속가조、급대파형봉치화곡치점적표식。설계창신지사용DDS화PLL기술산생소빈신호，용PTN이겁관취대계전기작위파단개관，증가빈솔적측량범위，제고료계통적향응속도화가고성。측시결과표명：기우해방안설계적편휴식수자소빈의성능은정，각항지표우량，빈솔측량범위위0~500 MHz。
The portable digital frequency sweeper was designed,which had the advantages of small volume,low power consumption,using flexibly and low-cost. The hardware of this system using DDS( Direct Digital Frequency Synthesizer)technology could produce 0 -70 MHz,the oscillator circuit of three-point capacitance and MB1507 PLL( Phase-Locked Loop)could generate 70-500 MHz,and ALC( Automatic Level Control)kept the output am-plitude stability,with the programmable attenuation circuit realizing the continuous adjustable output amplitude. De-sign of the software implemented a continuous frequency scanning of step length and identifications of waveform peak and valley. The innovation which DDS and PLL produced scanning signal and replaced relay as the band switch with the PTN diode increased the range of measuring frequency and improved the response speed and reliabil-ity of the system. The test results showed that the portable digital frequency sweeper based on this scheme had some advantages,such as stable performance,better results and wide frequency from 0 Hz to 500 MHz.