57. What is the requirement for phase noise at 1k offset, 10kHz offset, and 100kHz offset for GSM handset? GSM手机的相位噪声为1k、10kHz和100kHz的情况下,需要满足什么条件?答:For GSM handset RX it has several architectures to implement: Superheterodyne,near zero-IF,zero-IF,different architecture may have different LOs requir