Update Second_meeting.md

docs/aameeting/Second_meeting.md

@@ -1,13 +1,20 @@
 # Second AA Meeting
->[x] ---06/02/2020 by Yidi Song     
+>[x] ---06/02/2020 by Yidi Song, Yimian Liu     
 >[x] Participaants: Boyao Yang, Weizhou Wen, Yimian Liu, Yidi Song   
 >[x] Location: EE 5 floor AA office   
 
 ## Ques
  - LT5512 spice models
  - the size and layers of PCB
+ - Design details about IF LPF
+ - BNC adapter
 
-## Outline
-- 
 ## Techninal Suggestions    
-- 
+- Use spice to simulate
+- Find some similar IC simulation models
+- Set up the IC by what we want to test
+- Remove all unnecessary Filter and only leave mixer
+- Altium Designer is recommanded to use
+- Contact lab members to find out the port of spectrum analyzer
+- Buy SMA-BNC adapter if necessary
+- Components list ASAP, do not suggest to buy by ourselves