原帖由 war3sai 於 2009-8-23 02:20 PM 發表 . M* Q0 r( P$ w- R, F8 R, |因為不知道要如何分享圖2 h+ C) x* ~2 @7 b5 w2 q a
想說用文字描述 希望大家能幫幫忙orz3 D% L: G# v8 J; q4 b
buffer stage我看別人是用一個inverter 輸出經5.6k電阻接回輸入; a. d& q. {( M+ w: }7 c
震盪訊號經由一個490fF的電容才接到inverter的輸入! y" Q/ c, E+ C% q" Y. ?. D
想問這電阻和電容的功用是什麼 他 ...
5 s& M9 o( S8 w3 MI think res and cap serve as a high-pass filter 8 k3 |: [8 M0 W% Oso the cut off frequency of this filter should be much less than vco output frequency