Dear Sir,
Using Figure 25. Recommendation Inverting Gain Circuit in datasheet, a customer tested and found unexpected peek frequency response at 1.5GHz (+10dB) when Rin 25ohm is changed to 0ohm (pin3 is connected to ground). There is no peek observed when 25ohm is existed. May I ask why?
The resistance network values are;
Rg=Rf=240 ohm and Rt=62 ohm. (Gain=-1)
This phenomenon was not seen on TINA Simulation but actual measurement.
If you gave me your email address I can send actual measurement data.
Best regards,
Masa