X-band Dro Frequency Comprehensive Source Of Design

In modern microwave and millimeter wave communication systems, the low phase noise frequency sources have the key effects in the systems'performance. Especially in the national defence, the effects are more obvious. So in this paper, a method to realize the low phase noise X-band frequency source has been proposed, designed, produced and tested.In the first chapter, the class of modern frequency composing techniques and the recent development situations have been introduced. Then the advantages and disadvantages of the techniques have been described. At last, based on the techniques mentioned above, a scheme to realize the X-band low phase noise frequency source has been proposed.The second chapter is a section of device phase noise analysis, many useful devices such as multipliers, amplifiers, mixers, oscillators and PLL (phase locked loop) have been discussed. Then some theory formulas have been inducted. These discussions and formulas are necessary in the subsequent sections.The third chapter is a section of system design and test data. In this chapter, the suitable devices and circuit structure have been choosed to design a second order multiplier, a fifth order multiplier, a sixth order harmonics mixer and a DRO operating in 9.4GHz.The forth chapter is a section of system realization and test, in this chapter, the system of low phase noise frequency source has been constructed and tested. The results show that the targets of the system have been achieved.In the last chapter, a conclusion of the system design has been done. Besides, the possible problems and the solve methods have been illuminated also.