摘要
介绍了一个X波段频率合成器的设计，该频率合成器通过采用混频锁相环的方式实现，本振锁相环输出8GHz的信号，作为混频器的本振信号，混频环最终输出信号为8．5～9．0GHz，输出静态相位噪声为-93dBc／Hz@1kHzoffset。此外，还研制了一种小型化的隔振器来降低振动对晶振的影响，对环路也采取了相应的减振措施，提高了该合成器在振动下的相位噪声，振动环境下相位噪声为-90dBc／Hz@1kHzoffset。
The design of a X-band frequency synthesizer is presented in this paper. We use the mixing phaselocked loop to realize the synthesizer. The local phase-locked loop （PLL） outputs frequency of 8 GHz as the LO source of the mixer and the mixing PLL＇s output range is 8.5 GHz to 9 GHz. The static phase-noise of the output at 1 kHz off the carrier is -93 dBe/Hz@l kHz offset. Besides we use a vibration isolator to reduce the influence of the vibration on the crystal oscillator. We also take measures to reduce the vibration of the PLL, thus the phase noise performance of the synthesizer has been improved. The phase-noise at 1 kHz off the carrier is --90 dBc/Hz@l kHz offset under vibration.
出处
《压电与声光》
CSCD
北大核心
2011年第4期643-646,共4页
Piezoelectrics & Acoustooptics
关键词
X波段
频率合成
锁相环
抗振
相位噪声
X-band
frequency synthesizer
PLL
antivibration
phase-noise
