[SI-LIST] Re: AC coupling HDMI signals

  • From: Joel Brown <joel@xxxxxxxxxx>
  • To: "Hassan O. Ali" <hassan@xxxxxxxx>, SI-List <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 05 Jul 2006 08:44:43 -0700

 Hassan,
I found a buffer made by TI (SN65LVDS100/101) which has a wide common mode
input range which should be able to receive the TMDS signal using DC
coupling. It also appears the output can be biased to 2.0V which is
compatible with the CML part I want to interface to. I think it could also
beused to go from CML to TMDS. What do you think?

Joel


Hassan O. Ali wrote: Joel, The answer is generally no - except if you're
using special receivers that can reverse the effect of ac-coupling (dc
offsetand pulse width distortion). Those receivers do exist out there. If
youuse ac-coupling caps with high enoguh value (in uF range) and if the
receiver has a low enough low frequency cut-off you can successfully
ac-couple your driver and receiver. Best regards. Hassan. On Jul 03, Joel
Brown <joel@xxxxxxxxxx>[1] wrote: Is it possible to AC couple (using
capacitors) HDMI or DVI signals? We need to feed DVI signals which are
biasedto 3.3V into a part that uses CML levels that are biased to 2.0V.
Thanks - Joel 

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