微波自振混频技术研究
发布时间：2018-09-04 11:51
【摘要】：随着对微波技术的不断研究,对微波电路小型化、低功耗、低成本的需求也在日益增长。自振混频技术是集混频功能和本振功能于一体的技术,可以在一个有源器件上实现两种功能。将该技术应用在接收机前端,可以简化电路的结构并降低成本。自振混频技术在雷达系统、辐射计、通信系统等很多领域都展现出巨大潜力,因此有必要对自振混频技术进行深入的研究。本文介绍了自振混频技术的发展动态和工作机理,通过基于辅助源电路的谐波平衡方法对自振混频器进行仿真分析及优化,并对该方法进行了详细分析。以提高变频增益和提升信号接收灵敏度为目标,分别研制了X波段自振混频器、二次谐波自振混频器和三次谐波自振混频器。本文首先研制了X波段振荡器,对振荡器的工作原理进行分析后,分别对振荡器各部分结构进行设计,并进行小信号分析及大信号分析。该振荡器实现稳定起振,振荡频率12GHz,输出功率9.83dBm,为研制自振混频器起到铺垫作用。其次,采用FET管研制了性能优良的X波段自振混频器,该自振混频器实现接收灵敏度-90dBm,在-42dBm变频增益达到最大值为5.5dB。谐波自振混频技术是基于基波自振混频技术的更深层次研究。对谐波自振混频技术的原理和特点进行分析后,采用平衡式结构研制谐波自振混频器。在输出端采用同相叠加功率合成的结构研制出二次谐波自振混频器,实现接收灵敏度-90dBm,最大变频增益2.7dB。同时在输出端采用巴伦结构研制出三次谐波自振混频器,并实现接收灵敏度-80dBm,最大变频增益3.5dB。最后,本文提出将锁相环与自振混频技术相结合,以提升自振混频器工作的稳定性和变频增益。在分析了锁相环的工作原理后,基于自振混频器的电路拓扑结构,提出了锁相电路实现方案。锁相环电路采用单环整数分频的实现方案,设计相应有源环路滤波器,对X波段自振混频器实现锁定,锁定频率12GHz,最终实现变频增益最大值为8.8dB。本文对自振混频技术进行了深入的分析和研究,对电路的小型化具有积极推动作用及参考价值。
[Abstract]:With the continuous research of microwave technology, the demand for miniaturization, low power consumption and low cost of microwave circuits is increasing day by day. The self-vibration mixing technology is a technology that integrates the mixing function and the local oscillator function, and can realize two functions on one active device. The application of this technique in the front end of the receiver can simplify the circuit structure and reduce the cost. The natural mixing technology has shown great potential in many fields, such as radar system, radiometer, communication system and so on. Therefore, it is necessary to deeply study the natural vibration mixing technology. This paper introduces the development trend and working mechanism of the self-vibration mixing technology. The harmonic balance method based on auxiliary source circuit is used to simulate and optimize the self-vibrating mixer, and the method is analyzed in detail. In order to improve the frequency conversion gain and the signal receiving sensitivity, the X-band self-oscillating mixer, the second-harmonic self-oscillating mixer and the third-harmonic self-oscillating mixer are developed respectively. In this paper, the X-band oscillator is first developed. After analyzing the working principle of the oscillator, the structure of each part of the oscillator is designed, and the small signal analysis and the large signal analysis are carried out. The oscillation frequency is 12 GHz and the output power is 9.83 dBm, which can pave the way for the development of the self-oscillating mixer. Secondly, an X-band self-oscillating mixer with excellent performance is developed by using FET transistor. The self-oscillating mixer achieves a receiving sensitivity of -90dBm and a maximum gain of 5.5 dB at -42dBm. Harmonic self-mixing technology is based on the fundamental wave self-mixing technology deeper research. After analyzing the principle and characteristics of harmonic self-vibration mixing technology, the harmonic self-vibration mixer is developed with balanced structure. The second harmonic self-oscillating mixer is developed by using the structure of in-phase superposition power combination at the output. The receiver sensitivity is -90 dBm and the maximum frequency conversion gain is 2.7 dB. At the same time, the third harmonic self-oscillating mixer is developed with Barron structure at the output. The receiver sensitivity is -80 dBm and the maximum frequency conversion gain is 3.5 dB. Finally, this paper proposes to combine the phase-locked loop with the self-oscillation mixing technology to improve the stability and frequency conversion gain of the self-oscillating mixer. After analyzing the working principle of PLL, based on the circuit topology structure of self-oscillating mixer, the realization scheme of PLL is put forward. The phase-locked loop circuit adopts the scheme of single-loop integer frequency division, and the corresponding active loop filter is designed. The X-band self-oscillating mixer is locked, the frequency is locked at 12GHz, and the maximum frequency conversion gain is 8.8 dB. In this paper, the technology of natural vibration mixing is deeply analyzed and studied, which has a positive effect on the miniaturization of the circuit and has a reference value.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN773
本文编号：2222020
[Abstract]:With the continuous research of microwave technology, the demand for miniaturization, low power consumption and low cost of microwave circuits is increasing day by day. The self-vibration mixing technology is a technology that integrates the mixing function and the local oscillator function, and can realize two functions on one active device. The application of this technique in the front end of the receiver can simplify the circuit structure and reduce the cost. The natural mixing technology has shown great potential in many fields, such as radar system, radiometer, communication system and so on. Therefore, it is necessary to deeply study the natural vibration mixing technology. This paper introduces the development trend and working mechanism of the self-vibration mixing technology. The harmonic balance method based on auxiliary source circuit is used to simulate and optimize the self-vibrating mixer, and the method is analyzed in detail. In order to improve the frequency conversion gain and the signal receiving sensitivity, the X-band self-oscillating mixer, the second-harmonic self-oscillating mixer and the third-harmonic self-oscillating mixer are developed respectively. In this paper, the X-band oscillator is first developed. After analyzing the working principle of the oscillator, the structure of each part of the oscillator is designed, and the small signal analysis and the large signal analysis are carried out. The oscillation frequency is 12 GHz and the output power is 9.83 dBm, which can pave the way for the development of the self-oscillating mixer. Secondly, an X-band self-oscillating mixer with excellent performance is developed by using FET transistor. The self-oscillating mixer achieves a receiving sensitivity of -90dBm and a maximum gain of 5.5 dB at -42dBm. Harmonic self-mixing technology is based on the fundamental wave self-mixing technology deeper research. After analyzing the principle and characteristics of harmonic self-vibration mixing technology, the harmonic self-vibration mixer is developed with balanced structure. The second harmonic self-oscillating mixer is developed by using the structure of in-phase superposition power combination at the output. The receiver sensitivity is -90 dBm and the maximum frequency conversion gain is 2.7 dB. At the same time, the third harmonic self-oscillating mixer is developed with Barron structure at the output. The receiver sensitivity is -80 dBm and the maximum frequency conversion gain is 3.5 dB. Finally, this paper proposes to combine the phase-locked loop with the self-oscillation mixing technology to improve the stability and frequency conversion gain of the self-oscillating mixer. After analyzing the working principle of PLL, based on the circuit topology structure of self-oscillating mixer, the realization scheme of PLL is put forward. The phase-locked loop circuit adopts the scheme of single-loop integer frequency division, and the corresponding active loop filter is designed. The X-band self-oscillating mixer is locked, the frequency is locked at 12GHz, and the maximum frequency conversion gain is 8.8 dB. In this paper, the technology of natural vibration mixing is deeply analyzed and studied, which has a positive effect on the miniaturization of the circuit and has a reference value.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN773
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