本文選題：壓控振蕩器 + 頻率合成　； 參考：《電子科技大學》2015年碩士論文

【摘要】：頻率源幾乎是所有微波測試測量,通信系統(tǒng)以及監(jiān)控系統(tǒng)的關鍵部分,不論是在軍用或是民用電子設備中都不可或缺。現(xiàn)代頻率綜合有多種多樣的頻率合成技術,可滿足寬帶寬,小步進,低相噪等各種指標的要求。針對不同電子設備的系統(tǒng)指標要求,頻率源演變出很多不同的設計方法。隨著雷達系統(tǒng)及通信系統(tǒng)性能的提升,對頻率源的帶寬、跳頻時間、步進以及相位噪聲這些指標有了更高的要求。本文討論分析了寬帶頻率源合成技術,對頻率合成的幾種方案進行討論。在傳統(tǒng)振蕩器的基礎上對寬帶壓控振蕩器進行了研究分析,最終利用分立元件設計了推挽結構的寬帶壓控振蕩器和集電極壓控振蕩器,并對其進行比較。在推挽結構寬帶VCO的基礎上實現(xiàn)頻率源的寬帶寬,并使用鎖相環(huán)結合DDS的混合頻率合成方式來實現(xiàn)了頻率源的小步進設計。經(jīng)過對硬件系統(tǒng)的調(diào)試,最終使得系統(tǒng)滿足設計要求。經(jīng)過對不同方案的論證及各項指標的計算,最終采用的系統(tǒng)是由電源模塊、寬帶VCO和PLL+DDS以及功率調(diào)整模塊四個硬件模塊構成。其中硬件電源部分是為各模塊提供所需電壓,寬帶VCO采用的是推挽型結構的壓控振蕩器,它能實現(xiàn)較寬的帶寬以及較好的穩(wěn)定性,PLL+DDS由寬帶VCO構成的PLL級聯(lián)DDS實現(xiàn),而功率調(diào)整模塊則是對最終的輸出功率進行調(diào)整使其達到系統(tǒng)功率指標的要求。通過對系統(tǒng)的仿真、測試、調(diào)試后系統(tǒng)最終頻率輸出為1000MHz-1500MHz,頻率分辨率為100Hz,在1500MHz輸出時相位噪聲為-80dBc/Hz@10kHz、-104dBc/Hz@100kHz;雜散≤-45dBc。
[Abstract]:Frequency source is an essential part of almost all microwave measurement, communication and monitoring systems, whether in military or civil electronic equipment. Modern frequency synthesis has a variety of frequency synthesis technology, which can meet the wide bandwidth, small step, low phase noise and other requirements. According to the system requirements of different electronic equipment, the frequency source evolves many different design methods. With the improvement of the performance of radar system and communication system, the bandwidth of frequency source, frequency hopping time, step and phase noise have higher requirements. This paper discusses and analyzes the technology of broadband frequency source synthesis, and discusses several schemes of frequency synthesis. Based on the traditional oscillator, the wideband voltage-controlled oscillator is studied and analyzed. Finally, a push-pull structure wideband voltage-controlled oscillator and a collector voltage-controlled oscillator are designed and compared using discrete elements. The wideband width of the frequency source is realized on the basis of the push-pull structure broadband VCO, and the small step design of the frequency source is realized by using the hybrid frequency synthesis method of PLL and DDS. After debugging the hardware system, finally make the system meet the design requirements. The system is composed of four hardware modules: power supply module, broadband VCO and PLL DDS and power adjustment module. The hardware power supply part provides the required voltage for each module, and the wideband VCO adopts a push-pull type voltage-controlled oscillator. It can realize wider bandwidth and better stability. PLL DDS is realized by PLL cascade DDS composed of wideband VCO. The power adjustment module is to adjust the final output power to meet the system power requirements. Through the simulation and test of the system, the final frequency output of the system is 1000MHz-1500MHz, the frequency resolution is 100Hz, the phase noise of the 1500MHz output is -80dBc / Hzr 10kHz / 104dBc / HzBc / HzBZ 100kHz; the spurious 鈮，

本文編號：1975073