本文简要介绍了导脉冲信号的形成原理并提出了一种小型化、低功耗、高衰减动态的导脉冲组件.经测试,该组件功耗约1w,衰减动态高达100dB,精度误差≤5dB,尺寸仅为57mm×35mm×9mm,重量约30g,能够满足日益增长的高度综合化,小型化,低功耗的航电系统的设计需求.
本文采用微组装工艺结合有源MMIC与无源微带电路混合集成的方式,介绍了一种工作于P波段至L波段的宽带小型化多通道激励模块.和传统的激励模块相比,本模块尺寸大幅减小,带宽更宽、重量更轻,集成度更高.测试结果表明,激励模块实现了小型化、宽带、低功耗、低杂散,高隔离,具有一定的通用性.
The phase noise composition and characteristics of a digital Phase Locked Loop(PLL) are investigated. A phase locked frequency synthesizer based on crystal oscillator multiplication is presented. Compared with the traditional frequency synthesizer based on single PLL,the proposed design achieves lower phase noise. According to the test results,the phase noise of -109.1 dB/Hz@10 kHz is achieved by the traditional approach when the output is 6 480 MHz; while a better phase noise performance of -117 dB/Hz@ 10 kHz is reached by the proposed design at the same frequency,using the same crystal oscillator PLL chip and Voltage Controlled Oscillato(VCO), which is improved by 8 dB compared to the traditional design.
