GB product budgeting

GB with $r_o=0$

In this case the minimum value of the GB product equals:

$$ \mathrm{GB}_{\mathrm{min}}=9.335\cdot 10^{+18}\,C_{i}+9.0\cdot 10^{+7} $$

and the order is: 1

GB as a function of $r_o$ and $C_i$

A nonzero value of $r_o$ introduces a pole with a frequency above $\frac{1}{2\pi (R_{\ell}+R_o)C_f}$

This is a non-dominant pole and the influence of $r_o$ on the frequency range of interest will be ignored.