近年来,把完整的射频无线电接收器整合至芯片的趋势已开始挑战超外差无线电结构的主导地位,IC设计人员现在想借用单次变换技术来实现相同效能,而不是采用超外差技术的两次变换结构或在相对较高的固定中频执行信道滤波。然而,受到传统上对超外差接收机结构较有利的多项因素的影 In recent years, the trend of integrating a complete radio frequency receiver into a chip has begun to challenge the dominance of superheterodyne radio architectures. IC designers now want to borrow a single conversion technique to achieve the same performance, instead of using superheterodyne Transform the structure twice or perform channel filtering at a relatively high fixed intermediate frequency. However, there are many factors that have traditionally been more favorable to the construction of superheterodyne receivers