Loop gain measurement with Tpa6120

[proid]

I tried measure loop gain of tpa6120 but i see weird problem. As you can see, Vin is 0db, that mean Vfb must be -6db (1/2 divider) but i got about -26db. I tried both Ltspice and tina spice, it's still the same, replace tpa6120 with some VFB opamp and i got correct -6db, is this a "feature" of CFA opamp?

 

[BesPav]

Open LTspice loopgain example with Tian probe and put TPA6120 in.

 

[xanalogtech]

check input Z at inverting amp input. Low for CFA.