Hello,
On one of our new products we want to monitor Fast Ethernet Signals (100BASE-TX).
To add minimal signal distortion to the actual Ethernet communication that is being monitored we want to add non-inverting operational amplifiers with a Gain of 1.
The four signals (two differential pairs) shall not be modified, we just want to have a high-impedance input monitoring the Ethernet signals.
In a first try we used four THS4631, connected Vout- to Vin-, Vs+ to +5V and Vs- to -5V, both voltages generated by a DCP010505DBP.
In operation the signals at Vout- are not equal to Vin+ and are not recognized by the Ethernet PHY monitoring the communication.
Am I using a wrong operational amplifier? Do you recommend a different device for this purpose?
Thank you very much for your help!