基于时变反相积分器的双模FM/AM调制器
A Dual-Mode FM/AM Modulator Based on a Time-Varying Inverting Integrator
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中文总结 AI 辅助
本文设计并制作了基于时间调制变容二极管的双模FM/AM调制器，利用微带技术实现，通过理论推导、数值模拟与实验验证，证明时变电容可作为传统FM技术的替代方案用于电信和雷达领域。
中文摘要 AI 辅助
本文对基于时间调制变容二极管的双模频率/振幅调制器进行了分析、设计、制作与实验验证。通过将变容二极管用作时变电容，结合配置为反相积分器的运算放大器与带通滤波器，所提电路可高效生成调频（FM）信号；经简单改动也可获得调幅（AM）信号。该电路采用微带技术实现，利用了时间调制电子元件的独特特性，尤其是其固有的混频能力。本文推导了解析表达式以预测生成波形的特性，并通过Keysight ADS中的数值模拟验证了这些表达式的准确性；随后制作了微带PCB原型并进行实验表征。测量结果与理论预测及数值模拟均吻合良好，所提方法展示了时变电容作为电信与雷达应用中传统FM技术的有吸引力替代方案的潜力。
英文摘要
This paper presents the analysis, design, fabrication, and experimental validation of a dual-mode frequency/amplitude modulator based on a time-modulated varactor diode. By exploiting the varactor as a time-varying capacitor in combination with an operational amplifier configured as an inverting integrator and a passband filter, the proposed circuit generates frequency-modulated (FM) signals in an efficient manner. Amplitude-modulated (AM) signals can also be obtained with a simple modification. The implementation, realized in microstrip technology, leverages the unique properties of time-modulated electronic components, particularly their inherent frequency-mixing capability. Analytical expressions are derived to predict the characteristics of the generated waveforms, and their accuracy is verified through numerical simulations performed in Keysight ADS. A microstrip PCB prototype is then fabricated and experimentally characterized. The measured results show excellent agreement with both the theoretical predictions and the numerical simulations. The proposed approach demonstrates the potential of time-varying capacitors as an attractive alternative to conventional FM techniques for telecommunications and radar applications.
