1. The problem statement, all variables and given/known data Given the transfer function: Find the phase relationship between the input and output voltage at high frequencies 2. Relevant equations NA 3. The attempt at a solution My approach was to find the phase of the transfer function, which I got to be: I assumed that "very high frequencies" meant w = ∞, plugging it in, I get the answer to be 0°. However, the answer from my teacher was that it was -180, because the transfer function had 2 poles, each at -90. While I can understand this, I wanted to know why my method was wrong.