Before revision: In that circumstance, for n identical first-order sections in cascade, the voltage transfer function of the complete network is given by; Edit, misleading image Please note that the circuit schematic immediately above is not buffering the output stages of the Ri-Ci filters.
After revision: In that circumstance, for n identical first-order sections in cascade, the voltage transfer function of the complete network is given by; Please note that the circuit schematic immediately above is not buffering the output stages of the Ri-Ci filters.