I'm designing a bandpass filter and have been doing some reading on it. I found a transfer function describing the circuit (which apparently all formulas describing this circuit are derived from):
$$\frac{V_{\text{o}}}{V_{\text{i}}} = -\frac{Kj2\pi f}{\left(1+\frac{jf}{f_1}\right)\left(1+\frac{jf}{f_2}\right)}$$
simulate this circuit – Schematic created using CircuitLab
Circuit Diagram of Inverting Bandpass Filter
Where do they get \$C_1\$, \$C_2\$, \$R_1\$, \$R_2\$ from?