1、对于TI的GSPS的ADC，采用两通道I、Q处理架构，每个通道fs。是否可以处理BW=0.8*fs的信号？ 是否可以采用零中频？（个人感觉理论上可以）。
2、这种差分架构前端驱动，国半是否有合适的VGA推荐。（不用Balun）。
3、对于Vcmo pin的用法，手册写 “.... For DC-coupled operation, this pin should be left floating or terminated into high-impedance. In DC-coupled Mode, this pin provides an output voltage which is the optimal common-mode voltage for the input signal and should be used to set the common-mode voltage of the driving buffer."这块如何理解，悬空后如何给input供电？
谢谢！
