By using irm , heterodyne receiver with good image rejection and mmw - to - if once frequency conversion can be realized , which simplified receiver constitution prominently . the number of local oscillation ( lo ) sources is reduces and electromagnetic compatibility ( emc ) of mmw system is improved . also , the size , weight , power consume and cost of mmw receiver is reduced 采用毫米波镜频抑制混频器,可在保证镜频抑制性能的前提下,采用1次变频接收机,从而大大简化接收构成,减少本振数量,改善毫米波系统电磁兼容性,减小接收机体积、重量、功耗,并降低成本。
More and more high - switch - rate and high - pin - density devices have been applied to the digital system along with the fast development of manufacture technics of integrate circuit ( up to 65nm ) , while the supply voltage of electronic system shows itself a fallen trend ( from 5v to 1 . 2v ) , signal integrity ( si ) , power integrity ( pi ) and electromagnetic compatibility ( emc ) problems have become increasingly serious 具体体现到高速pcb板级设计上,则为信号完整性( signalintegrity ,简称si ) 、电源完整性( powerintegrity ,简称pi )和电磁兼容性( electromagneticcompatibility ,简称emc )问题的影响已经达到了不可忽略的地步,经常会出现逻辑功能正确的数字系统不能在物理结构上实现。