Dec 9, 2008 #1 W wccheng Full Member level 5 Joined May 16, 2004 Messages 287 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,296 Activity points 2,710 Dear Folk, I always see a capacitor connected between a high frequency differential pair line. What is the functionality of this capacitor? Thanks wccheng
Dear Folk, I always see a capacitor connected between a high frequency differential pair line. What is the functionality of this capacitor? Thanks wccheng
Dec 9, 2008 #2 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,476 Helped 14,756 Reputation 29,794 Reaction score 14,119 Trophy points 1,393 Location Bochum, Germany Activity points 298,329 I very rarely see a capacitor in this place, mostly termination resistors. You should tell about the application.
I very rarely see a capacitor in this place, mostly termination resistors. You should tell about the application.
Dec 10, 2008 #3 S stober Junior Member level 3 Joined Mar 18, 2006 Messages 31 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,286 Location Shenzhen China Activity points 1,468 As a filter together with the resistance on the differential lines. In this way, 1pF capacitor equal to two 2pF capacitors put to each node respectively.
As a filter together with the resistance on the differential lines. In this way, 1pF capacitor equal to two 2pF capacitors put to each node respectively.
Dec 10, 2008 #4 kspalla Advanced Member level 4 Joined Aug 19, 2008 Messages 1,253 Helped 258 Reputation 516 Reaction score 94 Trophy points 1,328 Location Hyderabad, Andhra Pradesh, India Activity points 6,813 I think it is just for limiting the higher frequency emission if any. I mean to qualify for the radiation standards.
I think it is just for limiting the higher frequency emission if any. I mean to qualify for the radiation standards.
Dec 10, 2008 #5 BigBoss Advanced Member level 6 Joined Nov 17, 2001 Messages 5,960 Helped 1,609 Reputation 3,225 Reaction score 1,593 Trophy points 1,393 Location Türkiye Activity points 35,819 It can also be filtering purposes...
Dec 10, 2008 #6 W wccheng Full Member level 5 Joined May 16, 2004 Messages 287 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,296 Activity points 2,710 The value of the capacitor is depending on the frequency in the PCB path?