Figure 11: Conventional MOSFET based Fractional order CO.
Figure 12 shows the schematic of the proposed MOSFET based fractional order CO employing one FOC. The tap ratio remains fixed to 2 (C1=C2). Herein, C1 of integer value 0.3n has been replaced by a pseudo-capacitance of the same value with different fractional orders, α. At different fractional orders, the AC response curves of FOC (0.3nF s1-α, α=fractional order) have been obtained. This is done to ensure that the simulated FOCs of value 0.3nF are depicting fractional behavior in a given frequency domain. Progressive RC ladder structures have been used for the designing of fractional capacitors. The component values achieved by simulation via MATLAB for few orders (F=0.3n) have been listed in Table II.
Table II: Values of RC ladder components for various orders.