My customer have a question regarding the THS4531. Figure 75 in the datasheet sets the gain equation up as -Rf/Rg, as expected.
Their application is a little closer to Figure 68 with an input terminator of 75 ohms.
What they would like to understand is how balance is designed in this amplifier. What is the purpose of the 0.22uF/49.9 ohm R for “balancing the amplifier”? If there is no connection at Vin-, why wouldn’t the implementation just be DC-coupled and the Rit on Vin- be whatever value provides balance?