求推荐一款压控振荡器

Other Parts Discussed in Thread: DAC34SH84, TRF370417, TRF3765

最近在研究UWB脉冲,想用一款TI的压控振荡器(VCO)将2ns级的超宽带脉冲调制成4GHZ的频率,请问选哪种型号的IC??电路怎么搭建??谢谢专家们