An inverting amplifier with the DC gain of -9 (V/V) is built with an op amp having its
DC gain of 105
and corner frequency of 30 rad/s.
▪ Determine the 3-dB frequency of the inverting amplifier.
▪ Sketch the magnitude Bode plot of the voltage transfer function of the inverting amplifier.
The Attempt at a Solution
So I am dealing with this homework and I have absolutely no idea how to approach this problem.
Just to clear things out I do not want someone to do this for me as you'll all guess. But I am kinda asking for help on how to approach and start this problem. Also I am not sure what the question is. I know that that 3-db frequency is the half power point but because this is a DC gain I would think that I am dealing with a DC circuit and therefore I would not expect any frequency in this problem (but I am probably wrong). I am also having a hard time understanding why there are 2 given gains, the -9 V/V and the other 105
What are the difference in those gains. So far we've learned that an op amp can be represented with a simple circuit consisting of 2 resistors and Voltage-Controlled-Voltage source (VCVS).
So basically my question is how do I approach this and am I suppose to simplify the op amp with a simple amplifier circuit with 2 resistors and VCVS?
Thanks in advance.