Design Of Broadband Millimeter Wave Frequency Source Based On Phase-locked Technology

The continuous development of radio communication technology has brought great convenience to people's production and life,and has become an indispensable part.A high-quality Frequency synthesizer with stable,reliable and high-performance characteristics is the key to ensuring the proper operation of all radio systems.Modern wireless communication technology has higher and higher requirements on the performance of Frequency synthesizer,especially the requirements of agile frequency,wideband and small size.Therefore,the development of high-performance Frequency synthesizer is still one of the important topics.This paper is aimed to design two high-performance frequency sources to meet the needs of the whole equipment system.The project is divided into two parts: one is the calibration Frequency synthesizer which mainly generates 2.4GHz,20 MHz,100MHz and 2~18GHz signal.The other one is a millimeter wave Frequency synthesizer which can provide four channels 24~40GHz signals that work simultaneously and independently controllable when it is operating in A mode.At the same time,when the system is operating in the B mode,the Frequency synthesize can provide 6 channels of 24~40GHz signals,which can work simultaneously and independently controllable.Those two working modes are switched by internal switch.The main research contents of the thesis are as follows:Firstly,the theoretical basis of the phase-locked loop Frequency synthesizer is briefly introduced,which is mainly the theoretical principle of the phase-locked loop,including the relevant theory of phase detector,loop filter and voltage-controlled oscillator,etc.Secondly,through the analysis of the design indicators and related device performance,the program is demonstrated and the design scheme of each component is determined.The 2~18GHz part of the calibration source adopts the s ynthesis mode of PLL-driven PLL to meet the requirements and characteristics of wideband and small step,and the rest adopts frequency multiplication and frequency division to meet signal output requirements.The output frequency and control of the millimeter wave Frequency synthesizer are complicated,and the design adopts the method of single phase-locked loop frequency synthesizer and multiplier instead of the traditional multi-phase mixing method.The scheme has obvious advantages in terms of size and system complexity.Both Frequency synthesizers have completed the design requirements.The test results show that the spur suppression,frequency hopping time,phase noise and output power of the calibration Frequency synthesizer and the millimeter wave Frequency synthesizer meet the design requirements.The rationality of the scheme and device selection lays a theoretical and practical foundation for the later development of similar products.