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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> AC couple in 50 ohm buffer https://designers-guide.org/forum/YaBB.pl?num=1287544555 Message started by casual on Oct 19th, 2010, 8:15pm |
Title: AC couple in 50 ohm buffer Post by casual on Oct 19th, 2010, 8:15pm How do I determine the 50ohm buffer current? The current can be huge different for ac couple case and without ac couple case. For the case of 2VDD and 500mV ac swing: AC couple case: 500mV/50ohm=10mA (AC signal only) without AC couple case: 2V/50ohm=40mA!! (DC + AC signal) Just wanna know which case should be normally used for high-speed digital signal in gigahertz range? I think the without AC couple case, the current is too large and ac couple case should be used. Pls commend. |
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