**Part Number:**OPA131

Hi,

Actually I have a question mainly foucus on TI training, TI Precision Labs - Op Amps: Stability 2 Slides 8

https://training.ti.com/ti-precision-labs-op-amps-stability-2?cu=14685

"To measure the phase margin, we need to know the loop gain phase, or phase of Aol times beta, over frequency. Using the same log properties as before, we can simply subtract the phase of 1 over beta from the phase of Aol to get the phase of loop gain."

The phase is not expressed in log or dB, so how could we get phase(Aol)-phase(1/beta)=phase(Aol*beta)