论文部分内容阅读
ＣＤＭＡ移动系统（ＭＳ）中的 Ｔｘ链路系统框图示于图１。来自基带处理器ＭＳＭ３０００的基带信号由ＩＦＴ３０００（Ｑｕａｌｃｏｍｍ公司产品）调制为１３０ＭＨｚ ＩＦ信号。此被调制的信号上变频到ＲＦ发射频率前必须由混频器进行频带限制。然后，激励器和功率放大器（
The Tx link system block diagram in a CDMA mobile system (MS) is shown in Figure 1. The baseband signal from the baseband processor MSM3000 is modulated by the IFT3000 (Qualcomm) into a 130 MHz IF signal. This modulated signal must be band-limited by the mixer before it is upconverted to the RF transmit frequency. Then, the exciter and power amplifier (