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阻抗匹配

user5099033
Prodigy 193 points
Other Parts Discussed in Thread: TRF3705

下图是评估板TSW3085中的电路，图1是从DA3482中输出的IQ两路，图2是DA的IQ两路输出接入到正交调制模块TRF3705。图1中的49.9欧并联接地是匹配的哪里的阻抗？图2中虚线框中的预留电路有啥作用？图2中的49.9欧并联接地是匹配的哪里的阻抗？预留的C126有什么作用？