high current unity gain buffer !!

Hi all i have a trapezoidal wave of about 150ns rise n fall times with DC voltage built into it. i want to remove the DC from the signal and buffer it or amplify little bit (say 1.4 or 1.5 gain) without being distorted. i have two such lines with signals 180 deg out of phase. when i feed these signals into xDSL line driver/Buffer LT1794 then one line is distorted very much while the other is affected slightly. then i have to transmit these signals on a twisted pair differential bus.

  1. How to remove DC from the signal, simply adding a cap does not symmetrically shift the wave about 0V line. (or x-axis).
  2. Please someone guide me about how to buffer/amplify that trapezoidal signal without being distorted for providing about 400 to 500mA current as a maximum.
  3. and then how to get connected to the bus to transmit for a short period of time and then be disconnected for the rest of the time. thanks a lot.
Reply to
Matrix
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You can inject currents into the LT1794's summing-junction nodes.

Are you driving a transformer? DC currents could be a problem.

Will the LT1794's shutdown / disconnect capability suffice? Or is the part's 10us off and 2us on delay too much?

--
 Thanks,
    - Win
Reply to
Winfield Hill

What do you mean by summing junction diodes ?? Do you mean the conventional inputs (pins 3,4 & 7,8) and i should inject the current instead of voltage !!

YES, i have to drive an isolation transformer before i could transmit anything on the bus. What should i do to cater for the DC currents.

i am not shutting it down rather i have biased it permanently for 10mA current. Thanks.

W> >

Reply to
Matrix

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